Gravity Generators cannot be unanchored while active (#41256)

Gravity Generators cannot be unanchored while active (#41256)

* Add unanchor attempt check

* Combine shared component and server component

- Combines SharedGravityGeneratorComponent and GravityGeneratorComponent
- AutoNetworked the GravityActiveBool

* Remove SharedGravityGeneratorComponent

* Update to SharedGravityGeneratorComponent

* Fix to be a complete sentence

* Dirty GravityActive whenever changed

* Rename component and remove view variables

* Update referenced component name

* Move unanchor attempt to shared system

* Add client system

* Revert popup to PopupEntity

* Fix popup to be PopupClient

* Set access restriction on GravityActive