Fix exception when logging SQL w/ nil binary value.

Conflicts:
	activerecord/CHANGELOG.md

Convert column name to string only once

Remove deprecated file

Follow-up to #14905 and formatting pass [ci skip]

on the Getting Started guide.

[skip ci]

Added 2 changes suggested by @robin850 [skip ci]

column_for will raise in case column is not found for the given table,
so there is no need to handle that here.

Let's tell people that they should rely on Tokaido instead of Rails One
Click.

Fixes #14960.

Document ActionController::TestCase::Behavior#process

[ci skip]

[ci skip]

Remove tests method for test cases when controller can be inferred.

Typo, grammar and textual changes [ci skip]

This reverts commit fe985960, reversing
changes made to add95606.

Reorganize ActiveRecord's rake tasks

Only care about its truthiness rather than asserting specific true/false
values. If we need to check for the return value in particular, there will
be a test for that.

make `db:structure:load` listed with `rake -T`

This is a follow up to #14139.

/cc @carlosantoniodasilva

Fixed custom validation context bug for child associations

Use #include? instead of #any?, make it simpler

Test typecasting on instance rather than class itself

Also change other related test to use existing record rather than
creating new one.

bind parameters we not being propogated to simple subquery calculation
calls. This fixes it