fix(InterestManagementBase): Improve SetHostVisibility

[MrGadget1024]

Tested in Additive Levels example by adding terrains with tree details, spot lights, audio sources, and particle systems to each of the two subscenes. Turn sound on when playing the video below.

• Note that this is a virtual method, works by default for all interest mgmt, and can be overridden.

https://github.com/user-attachments/assets/d06a355a-9f46-45f5-83bb-297e5a2e6974

[miwarnec]

definitely useful. also risky since it would introduce new behaviour to all existing mirror projects (i.e. why are my lights suddenly changing?).

probably best to just leave this as virtual and studios can override to implement what they need.

[MrGadget1024]

That means a custom IM that user has to create because we don't handle the stuff we should out of the box. Not at all user friendly. They'd have to somehow learn that they even can create a custom IM, even with our template, copy the entire IM from one of ours, and then add the override for this stuff. How would users even know to do this?

[MrGadget1024]

How about an alternative, where IM has drop-down flags for what to handle?