Firewall: Rules: Remove safepoint actions, no consumers in GUI are left, and we don't know of any external API consumers

[Monviech]

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Describe the problem

Fixes: #10235

[fichtner]

eventually we need to put a more generic mechanism in place, but we can discuss this for a roadmap item in the future

[fichtner]

There's still

plist:/usr/local/opnsense/scripts/filter/rollback_cancel.php
plist:/usr/local/opnsense/scripts/filter/rollback_timer.php

along with the configd action definitions

[AdSchellevis]

We might be able to create some facility combined with a generic mvc pattern to identify changes (which should show the apply button), but there will likely be constraints (not all models are capable of tracking modifications currently). The persisted_at attribute is part of the puzzle here.