provide a Manage Permissions tab for Dashboard entity

MR created.

Tests are green, but PHPStan flags that we extend an internal class. Not sure if we could live with that. Tried other approaches, but this one was the less intrusive one for me.

Created MR to allow this feature in core. ✨ Allow generic config entities to opt in to the entity specific Manage Permissions form Active .

Great additions and cleanup!

I think this one is ready to go :)