Need to remove triggers from game state when removing an ability from a permanent

Existing TODO originally noted in #6585

When adding an ability to a permanent, if it's a triggered ability, it also gets added directly to the game state. This is necessary for triggering correctly when leaving the battlefield. However, the code that removes abilities from permanents doesn't account for this, but needs to. I noticed this very clearly with my initial mutate implementation in #14900, though after some simplification it turned out not to be needed. While the workaround in that circumstance was very simple, it's probably better to fix the underlying discrepancy if possible.

https://github.com/magefree/mage/blob/e3e948e33d660673b534717a6892c47315b3459f/Mage/src/main/java/mage/game/permanent/PermanentImpl.java#L464-L469

https://github.com/magefree/mage/blob/e3e948e33d660673b534717a6892c47315b3459f/Mage/src/main/java/mage/game/permanent/PermanentImpl.java#L479-L483

https://github.com/magefree/mage/blob/e3e948e33d660673b534717a6892c47315b3459f/Mage/src/main/java/mage/game/permanent/PermanentImpl.java#L499-L500

TriggeredAbilities has a method for removing all abilities from a particular source. But not currently a way to remove an arbitrary ability.

https://github.com/magefree/mage/blob/e3e948e33d660673b534717a6892c47315b3459f/Mage/src/main/java/mage/abilities/TriggeredAbilities.java#L320-L322