Show friendly message to install action mailbox if the related table does not exist

- This is similar to the work done in https://github.com/rails/rails/pull/31534

Fix warnings from Guides generation

After https://github.com/rails/rails/pull/35281  and https://github.com/rails/rails/pull/35036 AV warns about not having the compiled container.
Use the suggested with_empty_template_cache to overcome warning

Add note about has_many associations callbacks [ci skip]

Add a note explaining when the has_many associations callbacks will be called or not.

Add changelog entry for transliterate/parameterize accepting `locale` [ci skip]

Fall back to parent locale before falling back to the :errors namespace

overriden -> overridden [ci skip]

Add test for 'ActiveSupport::Inflector.transliterate'

Also add tests for parametrize and transliterate

Add `config.credentials.content_path` and `config.credentials.key_path` to the guide

This streamlines the lovely foundation Bogdan added. Mainly to add
guidance around encryption keys and remove some backticks.

Finally it adds some mention of how to access these files from Ruby
in apps.

[ Kasper Timm Hansen & bogdanvlviv ]

Improve output of `rails encrypted(:edit/:show) --help`

Add locale option to #parameterize

Parameterize is triggering I18n#transliterate. This method already
accepts a locale. It would be cleaner if similar to other string inflection
methods #parameterize also accepted 'locale' as a parameter.

Adds default trix content attachmment partial path

[ci skip] Fixed expanded option route example

Squish the deprecation messages across the codebase 

Sample example ->

Before:

prathamesh@Prathameshs-MacBook-Pro-2 blog *$ rails server thin
DEPRECATION WARNING: Passing the Rack server name as a regular argument is deprecated
and will be removed in the next Rails version. Please, use the -u
option instead.

After:

prathamesh@Prathameshs-MacBook-Pro-2 squish_app *$ rails server thin
DEPRECATION WARNING: Passing the Rack server name as a regular argument is deprecated and will be removed in the next Rails version. Please, use the -u option instead.

Mention `environment variable` instead of just `environment`

Use the -u switch for the `rails server` banner

Ran `cd actioncable && yarn build`.

[ Kasper Timm Hansen & Ryan Castner ]

- Because just passing the server argument to this command is
  deprecated in https://github.com/rails/rails/pull/32058

feat(js): Dynamic Actioncable WebSocket URL

Remove `MigrationTest#test_create_table_with_custom_sequence_name`

This test is only executed for OracleAdapter.

https://github.com/rsim/oracle-enhanced/pull/1846 adds
an equivalent spec for Oracle enhanced adapter.

Add example of the output of `rails routes --expanded` in the routing guide [ci skip]

- Instead of the note at the end, added an example of how the output
  looks by using the expanded switch.

An `author` has a lots of `posts` in the fixtures, so the result of
`author.post` and finding a `post` by `author_id` is non-deterministic.

https://travis-ci.org/rails/rails/jobs/504332292#L1202-L1208

Fix ActiveRecord query attribute method when given value does't respond to to_i method

change the line to check an attribute has user-defined type

ref: https://github.com/rails/rails/pull/35320#discussion_r257924552

check query attribute method is working when given value does not respond to to_i method