adding the exception RecordNotFound to UUID find
Implemented enqueue_at for ActiveJob's Backburner adapter
Active Job guide: Add info about queue_name prefix and clarity supporter features
Merge pull request #16642 from cristianbica/aj-doc-queue-name-prefix

Active Job Guide: Example of config queue_name_prefix [ci skip]
Merge pull request #16641 from cristianbica/aj-backburner-enqueue-later

Implemented enqueue_at for ActiveJob's Backburner adapter
Don't calculate in-place changes twice

Now that `changed_attributes` includes in place changes, we don't need
to override these methods in Active Record. Partially fixes the
performance regression caused by #16189
Merge pull request #16645 from sgrif/sg-perf-regression

Don't calculate in-place changes twice
[ActionMailer] require activejob railtie
Merge pull request #15932 from joseluistorres/issue-11957-uuids

adding the exception RecordNotFound to UUID find #11957
Merge pull request #16598 from seuros/master

[ActionMailer] require activejob railtie
Use system /tmp when testing actionpack

https://github.com/rails/rails/commit/c64bff2c87ebf363703c63ecd4a96d56a1a78364
added support for running actionpack tests in parallel. However it introduced
https://github.com/rails/rails/commit/c64bff2c87ebf363703c63ecd4a96d56a1a78364
since one cannot connect to a socket file that's inside a Vagrant synced folder
due to security restrictions.

Also rename the temporary files to be clear that they're rails-related, since
now they're placed outside the project directory.

Fixes https://github.com/rails/rails/commit/c64bff2c87ebf363703c63ecd4a96d56a1a78364