Removed deprecated method type_cast_code from Column
Remove deprecated AR::Connection#clear_stale_cached_connections! method
Merge pull request #11231 from neerajdotname/deprecated-type-cast-code

Removed deprecated method type_cast_code from Column
Merge pull request #11230 from frodsan/remove_deprecated_clear_stale_cached_connections_method

Remove AR::Connection#clear_stale_cached_connections! deprecated method
calling default_scope without a proc will raise ArgumentError

Calling default_scope without a proc will now raise `ArgumentError`.
Merge pull request #11229 from neerajdotname/deprecated-default-scope

calling default_scope without a proc will raise ArgumentError
Merge pull request #10604 from neerajdotname/delete_all_should_not_call_callbacks

Do not invoke callbacks when delete_all is called

Conflicts:
	activerecord/CHANGELOG.md
Remove `page_cache_extension` deprecated method
Merge pull request #11233 from frodsan/remove_page_cache_extension_method

Remove `page_cache_extension` method
Use block instead passing as argument
Remove deprecated `config.whiny_nils`
Merge pull request #11237 from vipulnsward/remove_whiny_nils

Remove deprecated `config.whiny_nils`
Remove deprecated `Date#to_time_in_current_zone`
Merge pull request #11236 from vipulnsward/deprecate_date_to_time_in_current_zone

Remove deprecated `Date#to_time_in_current_zone`
Removing not useful test related to reflect_on_all_associations

The comment in the test pretty much summarizes the issue.
`FIXME these assertions bust a lot`

Adding any type of association in class `Firm` will break this test.

I removed some deprecated stuff and this test failed.

I do not think this test provides any useful value. First of all who
counted last that 39 is the right number of associations.

Secondly there are a large number of tests which depend on reflection
returning right information about associations. Those tests will start
failing if there is a bug in the code.
update test names in testing guide [ci-skip]
Merge pull request #11244 from ccarruitero/testing-guide

update test names in testing guide [ci-skip]
Merge pull request #11240 from neerajdotname/remove-not-useful-test

Removing not useful test related to reflect_on_all_associations
Removed support for deprecated `counter_sql`
Merge pull request #11241 from neerajdotname/deprecated-counter-sql

Removed support for deprecated `counter_sql`