* [LYN-3717] When pulling in an actor FBX, two entities are spawned & [ATOM-15258] Clicking and Dragging fbx file into viewport produces 2 entities
* Added another operation to the CanSpawnEntityForProduct that checks the other products and can veto the creation process.
* The model product will not create an entity in case there is already an actor exported, which prevents the issue reported by two different teams/users.
Delete:
- I3DEngine
- Missions
- Time of day
- GameEffectsSystem Gem
- ImageProcessing Gem
- SVOGI Gem
- Various other things that don't do anything now that the legacy renderer has been removed.