Fix malformed asset_url in ActionController::Renderer

Extract `SchemaMigration.all_versions`

Fix `deserialize` with JSON array

Fix `direct` with params example [ci skip]

Use `SchemaMigration.all_versions` instead of
`SchemaMigration.all.map(&:version)` to avoid to instantiate AR objects.

Fixes #28285.

Since `ActionController:Parameters` does not inherit `Hash`, need to
explicitly convert it to `Hash`.
Also, `Parameters#to_h` returns `Hash` whose key is `String`. Therefore,
if merge as it is, the value will not be overwritten as expected.

Fix CI failure due to contain <U+2028>

```diff
diff --git a/actionpack/lib/action_controller/metal/redirecting.rb b/actionpack/lib/action_controller/metal/redirecting.rb
index a3159c29dd..1836a07d4e 100644
--- a/actionpack/lib/action_controller/metal/redirecting.rb
+++ b/actionpack/lib/action_controller/metal/redirecting.rb
@@ -50,8 +50,8 @@ module Redirecting
     #   redirect_to post_url(@post), status: 301, flash: { updated_post_id: @post.id }
     #   redirect_to({ action: 'atom' }, alert: "Something serious happened")
     #
-    # Statements after redirect_to in our controller get executed, so redirect_to doesn't stop the execution of the function.
-    <U+2028># To terminate the execution of the function immediately after the redirect_to, use return.
+    # Statements after +redirect_to+ in our controller get executed, so +redirect_to+ doesn't stop the execution of the function.
+    # To terminate the execution of the function immediately after the +redirect_to+, use return.
     #   redirect_to post_url(@post) and return
     def redirect_to(options = {}, response_status = {})
       raise ActionControllerError.new("Cannot redirect to nil!") unless options
```

https://travis-ci.org/rails/rails/jobs/207908041#L549

Remove useless `Migrator.schema_migrations_table_name`

 [ci skip]  Use return with redirect_to

Do not take screenshot if driver does not support screenshot

This reverts commit 84c1b107.

Reverted #28283 so reverted it's changelog update as well.

This reverts commit 0d73f911, reversing
changes made to 21ff8a49.

We don't want to silence Puma because it's start up messages can be
useful (to see threads, port etc). #28109 was instead fixed by not
running system tests by defaul with `bin/rails test` in #28286.

Avoid running system tests by default

These tests may be expansive so let's only allow users to run them
through `bin/rails test:system` or by passing a path to the `test`
command.

The same applies for `bin/rake test`.

Refs #28109.

Simply use `SchemaMigration.table_name` instead.

[ci skip] Fix ParameterMissing exception name in docs

Fix `rake db:schema:load` with subdirectories

Should be `ActionController::ParameterMissing` and not
`ActionController::MissingParameter`.

Corresponding change was done in guides in
https://github.com/rails/rails/pull/9816.

Related #25174.

`db:schema:load` doesn't work with subdirectories like previous
`db:migrate:status`. `Migrator.migration_files` should be used in
`assume_migrated_upto_version` to fix the issue.

Fix `rake db:migrate:status` with subdirectories.

`db:migrate` supports subdirectories and have a test.

https://github.com/rails/rails/blob/v5.1.0.beta1/activerecord/test/cases/migrator_test.rb#L78-L85

But `db:migrate:status` doesn't work with subdirectories. It is due to
`Dir.foreach(path)` is not the same with `Dir["#{path}/**/[0-9]*_*.rb"]`.

I extracted `migration_files` and sharing it in the both to fix the
issue. And added tests for `db:migrate:status`.

Silence puma startup messages in system test

Don't share `options` with a reference type column

Fx system test example [ci skip]

Since test suffix is automatically granted, it is not necessary to
specify it in generator.
Also, updated the generated file to contents actually generated.

Fixes #28109

`Capybara::RackTest::Driver` does not support taking screenshots. If call
`#save_screenshot` on `Capybara::RackTest::Driver` will raise the error.

```ruby
Error:
UsersTest#test_visiting_the_index:
Capybara::NotSupportedByDriverError: Capybara::Driver::Base#save_screenshot
```

To prevent errors, if driver does not support screenshot, do not call it.

Sharing `options` causes some unexpected behavior. If `limit: 2` is
specified, this means that 2 bytes integer for a reference id column and
2 chars string for a reference type column. Another example, if
`unsigned: true` is specified, this means that unsigned integer for a
reference id column, but a invalid option for a reference type column.
So `options` should not be shared with a reference type column.