Fixes #19541 - properly mark user <-> mail_notification relation

Mark `:inverse_of` on `User` and `UserMailNotification` objects
so the relation properties would be set automatically, even for
new in-memory instances.

refs #19534 - check EncryptValue class variables are defined

bed4594 added class variables to record logging state, but failed to
check it was defined before accessing them, causing exceptions when
decryption failed. Tests added for this new behaviour.

fixes #14699 - Enable host edit to accept new params

Prior to this commit:
Foreman plugins like Katello/Discovery extended the Host edit page
and added fields of their own.
For example
Katello adds things like Content Views, enviroments etc.

However they were unable to get their attibutes passed to the backend...

Fixes #19534 - removed excessive encryptor logging

Fixes #19534 - improved orchestration task logging

Fixes #19296 - Combination remove link shows correct tooltip

Fixes #19506 - reset cache after CR update

Fixes #19173 - build notification succeeds with expired token.

refs #19317 - move FiltersHelperOverrides to app/registries/

Uses class to hold state, should be kept in the autoload_once registry
directory.

Fixes #19504 - Quote puppet class filter in host form

So that the filter can contain characters such as ":"