Fixes #19632 - changed shim and grub1 PXE names

Fixes #19672 - fix bulk actions for plugins

Fixes #19459 - improve vm boot failure feedback

To be able to override the wait for vm ready we need to move
it to compute resource definition. Also improve Openstack one

Fixes #16159 - Rename mail alerts to not be Puppet specific

Right now, under 'my account', users get emails with alerts about the
status of their hosts regarding configuration management (e.g: if there
was an error, get an alert, or get a weekly summary of all hosts...

fixes #18200 - don't re-encrypt settings when value is unchanged

Fixes #19034 - add tasks for clearing expired notifications

fixes #19528 - rewrite FiltersHelperOverrides to support autoload

Replaces class-level filter search overrides storage with a query
against Foreman::Plugin, allowing the class to be reloaded and tested
safely. Removes another 'registry' class.

Fixes #19630 - ignore hidden admins

Fixes #19583 - reworded blank label for subnet

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.