Remove suggestion that Procs can be used as session secrets.

[ci skip]

deprecate `assert_blank` and `assert_present`.

They don't add any benefits over `assert object.blank?`
and `assert object.present?`

Allow toggling "about app's env", not just showing

Warning: "shadowing outer local variable - routes".

Unify routes output for console and web, ensure engine routes are shown in html routes table.

Closes #8649.

Fix info page style [ci skip]

Add join table migration generator to usage help. [ci skip]

[ci skip]

[ci skip]

Also changed the exception to UnpermittedParameters

Exception on unexpected params when enabled.

This reverts commit 162e2859.

This commit was added by mistake, sorry 🙇

- Reverting #a3cf03ef fixes the issue

Conflicts:
	activerecord/test/cases/relations_test.rb

This method doesn't need to be in the class, since it's only used only
from the instance.