[docs] Changes puts to logger.info [ci skip] 

Working with two different machines is hard 😓

[Matthew Draper & Yves Senn]

Closes #16860. (pull request to discuss the implementation)

This will avoid the warning in our tests. We delete all the
config/environments/ files in the test app so our default code will not
work.

Default to sorting user's test cases for now

ActiveJob Integration Tests

Dump the standard schema once instead of redoing it per test

Allows :limit defaults to be changed without pulling the rug out from
under old migrations that omitted :limit because it matched the default
at the time.

Updating Associations::Preloader docs

Replace drop sql statement to drop_table method

to drop sequences at the same time each tables dropped for Oracle

[ci skip]Correct variables in the sample code

Since cc03675d30b58e28f585720dad14e947a57ff5b the error message became like
"Could not load database configuration. No such file -"
which doesn't really tell what's actually missing.

[ci skip] application.rb -> development.rb in web-console docs

Removed any default margin from mail preview body.

/cc @yahonda

Closes #10247.

The same goes for tables with an "id" column but without primary key constraint.
Reading from the view works without configuration. If you have an updateable view
you need to use `self.primary_key = ''`.

SQLite3Adapter now checks for views in table_exists? fixes: 14041

Conflicts:
	activerecord/CHANGELOG.md

`AbstractAdapter#supports_views?` defaults to `false` so we have to turn it on
in adapter subclasses. Currently the flag only controls test execution.

/cc @yahonda

Remove extra newline from ActiveJob test template

[ci skip] change the line orientation on asset precompile page

Closes #16684.

This is achieved by always generating `GeneratedAssociationMethods` when
`ActiveRecord::Base` is subclassed. When some of the included modules
of `ActiveRecord::Base` were reordered this behavior was broken as
`Core#initialize_generated_modules` was no longer called. Meaning that
the module was generated on first access.