Now we can throw away the subclass and the generated methods will get
GC'd too

Speed up partial rendering by caching "variable" calculation

This commit speeds up rendering partials by caching the variable name
calculation on the template.  The variable name is based on the "virtual
path" used for looking up the template.  The same virtual path
information lives on the template, so we can just ask the cached
template object for the variable.

This benchmark takes a couple files, so I'll cat them below:

```
[aaron@TC ~/g/r/actionview (speed-up-partials)]$ cat render_benchmark.rb
require "benchmark/ips"
require "action_view"
require "action_pack"
require "action_controller"

class TestController < ActionController::Base
end

TestController.view_paths = [File.expand_path("test/benchmarks")]
controller_view = TestController.new.view_context

result = Benchmark.ips do |x|
  x.report("render") do
    controller_view.render("many_partials")
  end
end
[aaron@TC ~/g/r/actionview (speed-up-partials)]$ cat test/benchmarks/test/_many_partials.html.erb
Looping:
<ul>
<% 100.times do |i| %>
  <%= render partial: "list_item", locals: { i: i } %>
<% end %>
</ul>
[aaron@TC ~/g/r/actionview (speed-up-partials)]$ cat test/benchmarks/test/_list_item.html.erb
<li>Number: <%= i %></li>
```

Benchmark results (master):

```
[aaron@TC ~/g/r/actionview (master)]$ be ruby render_benchmark.rb
Warming up --------------------------------------
              render    41.000  i/100ms
Calculating -------------------------------------
              render    424.269  (± 3.5%) i/s -      2.132k in   5.031455s
```

Benchmark results (this branch):

```
[aaron@TC ~/g/r/actionview (speed-up-partials)]$ be ruby render_benchmark.rb
Warming up --------------------------------------
              render    50.000  i/100ms
Calculating -------------------------------------
              render    521.862  (± 3.8%) i/s -      2.650k in   5.085885s
```

Add missing `require "tmpdir"` in ActiveSupport::EncryptedFile

This follows up d97980a1.

Closes #34975.

Improve regexp of `html_safe_translation_key?`

Set sqlite3 gem version explicitly in generated Gemfile

Chaining named scope is no longer leaking to class level querying methods

Active Record uses `scoping` to delegate to named scopes from relations
for propagating the chaining source scope. It was needed to restore the
source scope in named scopes, but it was caused undesired behavior that
pollute all class level querying methods.

Example:

```ruby
class Topic < ActiveRecord::Base
  scope :toplevel, -> { where(parent_id: nil) }
  scope :children, -> { where.not(parent_id: nil) }
  scope :has_children, -> { where(id: Topic.children.select(:parent_id)) }
end

# Works as expected.
Topic.toplevel.where(id: Topic.children.select(:parent_id))

# Doesn't work due to leaking `toplevel` to `Topic.children`.
Topic.toplevel.has_children
```

Since #29301, the receiver in named scopes has changed from the model
class to the chaining source scope, so the polluting class level
querying methods is no longer required for that purpose.

Fixes #14003.

If they're not set we'll still fall back to localhost, but this makes it
possible to run the tests against a remote Postgres / Redis / whatever.

- Use `\z` instead of `$`
- Use character class instead of alternation
- Optimize alternation order

Fix NameError : Make debug exceptions works in an environment where ActiveStorage is not loaded.

Bugfix association loading behavior when counter cache is zero

NameError: uninitialized constant ActionView::CompiledTemplates::ActiveStorage

Follow up to #35154.

Specify sqlite gem version explicitly in bug report templates

Support before_reset callback in CurrentAttributes

Relax sqlite3 version dependency

Refs: rails/jbuilder#452

With this benchmark:

    require "bundler/setup"

    require "active_record"
    require "benchmark/ips"

    # This connection will do for database-independent bug reports.
    ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")

    ActiveRecord::Schema.define do
      create_table :posts, force: true do |t|
      end
    end

    class Post < ActiveRecord::Base
    end

    new_post = Post.new

    Benchmark.ips do |b|
      b.report("present?") do
        new_post.present?
      end

      b.report("blank?") do
        new_post.blank?
      end
    end

Before:

    Warming up --------------------------------------
                present?    52.147k i/100ms
                  blank?    53.077k i/100ms
    Calculating -------------------------------------
                present?    580.184k (±21.8%) i/s -      2.555M in   5.427085s
                  blank?    601.537k (± 9.2%) i/s -      2.972M in   5.003503s

After:

    Warming up --------------------------------------
                present?   378.235k i/100ms
                  blank?   375.476k i/100ms
    Calculating -------------------------------------
                present?     17.381M (± 7.5%) i/s -     86.238M in   5.001815s
                  blank?     17.877M (± 6.4%) i/s -     88.988M in   5.004634s

This improvement is mostly because those methods were hitting
`method_missing` on a lot of levels to be able to return the value.

To avoid all this stack walking we are short-circuiting those methods.

Closes #35059.

Cookie doesn't expire anymore unless a flag is set:

Add a link to where "inquiry" is defined in ActiveSupport docs [ci skip]

[ci skip]

Cleanup the whitelisting references after #33145

Update template missing text in Guide

Changes the Getting Started guide explanation for
`ActionController::MissingExactTemplate` error, to reflect the current message.

Follow up for #29286, #35148

[ci skip]

Invalidate all query caches for current thread

Add ability to change the names of the default handlers

- There is a regression in 6.0 introduced by #32937 where cookie
  doesn't expire anymore unless the new `use_cookies_with_metadata`
  configuration is set to `true`.

  This causes issue for app migration from 5.2 to 6.0 because the
  `use_cookies_with_metadata` flag can't be set to true until all
  servers are running on 6.0.

  Here is a small reproduction script that you can run in the console

  ```ruby
  ActionDispatch::Cookies

  request = ActionDispatch::Request.empty
  request.env["action_dispatch.key_generator"] = ActiveSupport::KeyGenerator.new('1234567890')
  request.env["action_dispatch.signed_cookie_salt"] = 'signed cookie'
  request.env["action_dispatch.cookies_rotations"] = ActiveSupport::Messages::RotationConfiguration.new
  request.env["action_dispatch.use_authenticated_cookie_encryption"] = true
  signed_cookie = request.cookie_jar.signed
  signed_cookie[:foobar] = { value: '123', expires: 1.day.ago }
  p signed_cookie[:foobar]
  ```

Fix and update template_missing image in guide

This commit updates the Missing Template image in the Getting Started
Guide.

The new image displays the current error message. Additionally:
- New image is a PNG file, whereas the current image is in fact a misnamed JPEG.
- New image is smaller.

Before:

```
$ file --mime -b template_is_missing_articles_new.png
image/jpeg; charset=binary
$ du -h template_is_missing_articles_new.png
464K    template_is_missing_articles_new.png
```

After:

```
$ file --mime -b template_is_missing_articles_new.png
image/png; charset=binary
$ du -h template_is_missing_articles_new.png
28K     template_is_missing_articles_new.png
```

[ci-skip]