Move rake routes task to rails command

Don't enforce UTF-8 by default

Use column alias of primary_key in limited_ids_for

With the disabling of TLS 1.0 by most major websites, continuing to run
IE8 or lower becomes increasingly difficult so default to not enforcing
UTF-8 encoding as it's not relevant to other browsers.

Don't accidentally lose includes in serialization

After a discussion with matthewd. It was mentioned that rake tasks need
to be moved to rails command.
See: https://github.com/rails/rails/issues/32117

Prevent `ActiveRecord::FinderMethods#limited_ids_for` from using correct primary
key values even if `ORDER BY` columns include other table's primary key.

Fixes #28364.

Active Record distinct & order #count regression

Merge pull request #32126 from marceloperini/marceloperini/add-nodoc-to-ActionView__Helpers__FormBuilder#emitted_hidden_id

Add :nodoc: to ActionView::Helpers::FormBuilder#emitted_hidden_id?

Raise an error if advisory lock in migrator was not released.

[ci skip]Change requring order of files in doc

This change was made at 4a835aa3

Support i18n key at translation of value in submit tag

Correct `to` option's value of the route in the Bound Parameters sect…

Currently submit_tag value translation does not support i18n key style
locale key.
It confuses me a bit because many other components support i18n key
style locale key.
I added i18n key style locale key support to submit tag.

Remove extra changelog added by #31944

Previously it was removed by #32106 since it was backported to `5-2-stable`.

[ci skip]

Prevent older versions of Chrome from appending a Content-Type header containing the Blob type, rendering the request invalid if we intend not to provide a Content-Type. This behavior was observed in Chrome 58.

delegate to, with private: true option

Actually `reflection.klass` should be valid AR model unless
`polymorphic?`. Previously it worked limitedly by ignoring `NameError`
even if `reflection.klass` is invalid, and our isolated testing depends
on the limited working.
Probably we should also check the klass validity in `check_validity!`
properly. Until that time, I restored the error suppression for now.

Closes #32113.

See 948b9319 for context

Currently the place where we limit what gets sent to the database is in
the implementation for `partial_writes`. We should also be restricting
it to column names when partial writes are turned off.

Note that we're using `&` instead of just defaulting to
`self.class.column_names`, as the instance version of `attribute_names`
does not include attributes which are uninitialized (were not included
in the select clause)

Fix customizing the download Content-Type for a directly-uploaded blob via a signed URL. See e8286ee2.

Since #31895, build of 2.5 and AR combination failed.
https://travis-ci.org/rails/rails/jobs/346064349#L1638

It seems to be the reason that model is not loading properly, so I added
require. But I'm not sure if this is correct

Remove changelogs for Rails 6.0 since they were backported to `5-2-stable`

[ci skip]

Remove railties' changelog added by 7340596d
since it was backported to `5-2-stable` via ac99916f

Remove activesupport's changelog added by 1077ae96
since it was backported to `5-2-stable` via a2b97e4f

Remove activesupport's changelog added by 0d41a76d
since it was backported to `5-2-stable` via cdce6a70

Remove activestorage's changelog added by d57c52a3
since it was backported to `5-2-stable` via 5292cdf5

Follow up c113bdc9

Follow up of 6d63b5e4.

Make `reflection.klass` raise if `polymorphic?` not to be misused

This is an alternative of #29722, and revert of #29601 and a1fcbd97.

Currently, association creation and normal association finding doesn't
respect `store_full_sti_class`. But eager loading and preloading respect
the setting. This means that if set `store_full_sti_class = false`
(`true` by default), eager loading and preloading can not find
created polymorphic records.

Association creation and finding should work consistently.

Since #32034, Rails 6 requires Ruby 2.4.1+.

Use lazy load hook to configure ActiveStorage::Blob

`to_prepare` callbacks are run during initialization; using one here
meant that `ActiveStorage::Blob` would be loaded when the app boots,
which would in turn load `ActiveRecord::Base`.

By using a lazy load hook to configure `ActiveStorage::Blob` instead,
we can avoid loading `ActiveRecord::Base` unnecessarily.

Update default HSTS max-age value to 1 year