Fix yarn issues on CI

Update a tag for missing <dl> in guides

The errors below heppens in executing `bundle exec rake
guides:validate`.

```
$ bundle exec rake guides:generate:html
(snip)
$ bundle exec rake guides:validate
(snip)
  ./output/active_record_querying.html has 57 validation error(s):

    ERROR; line 55: Element “dt” not allowed as child of element
    “div” in this context. (Suppressing further errors from this
    subtree.)
(snip)
```

We want to yarn install in the template dir so that templates get a
yarn.lock copied over.

The app template is in a higher-level directory than
test/isolation/assets, so these paths wern't accurate.

Add `HTTP Token authentication` section to guide [skip ci]

Remove unused require

`extract` was removed at 0fa8c0a1

Remove Resolver autoload

This class has been removed in #37695 but I just noticed this lingering
around while doing some other work!

Fix ActiveStorage::Blob#service method redefined warning

Fix undefined method `start_with?' for :to_json

Relocate require in AS::Deprecation

rubocop-performance v1.5.1 includes bug fixes for that cops.

https://github.com/rubocop-hq/rubocop-performance/releases/tag/v1.5.1

It is a part of `env.delete_if { |k, v| k.match?(/^(action_dispatch|rack)\.request/) }`.

Without this, it's possible to encounter:
NoMethodError: undefined method `on_jruby?' for Concurrent:Module

See also https://github.com/ruby-concurrency/concurrent-ruby/pull/833

Remove ConnectionAdapters::Resolver in favor of DatabaseConfigurations

We have these two objects, `ConnectionAdapters::Resolver` and
`DatabaseConfiguratons` that implement a lot of the same logic. One of
them is used for configurations defined in `config/database.yml` and the
other is used when passing raw configurations `String` or `Hash` objects
into methods like `establish_connection`.

Over time these two have diverged a bit. In the interest of less code
complexity, and more consistency for users this commit brings them back
together.

* Remove `Resolver` altogether and replace its primary method with
  `DatabaseConfigurations#resolve`.

* Move `resolve_pool_config` over to the `ConnectionPool` alongside the code
  that uses it.

Add missing require for Concurrent::ThreadLocalVar

Fixes #37697

Simplify dangerous_class_method?

Closes #37595

I changed `load_defaults` to `config.load_defaults` in the guide
to emphasize its context,
sorted headers "With 'x.x'" in descending and rephrased them
to "With 'x.x', it includes previous versions' new defaults"
and documented the method on https://api.rubyonrails.org.

Closes #37496

Update form examples [ci skip]

Additionally order by primary key if implicit_order_column is not uniq

Fix inconsistent capitalization of Article in getting started

In the getting started, we're asked to add `"<h1>New Article</h1>"`
while later on in the guide it is referenced as `"<h1>New article</h1>"`

This pull request aims at fixing this small inconsistency.

[ci skip]