Consider "Dynamic Modifiers only" NavMesh for avoidance during navigation

[Leroy231]

Current avoidance can lead to stuck entities since if an entity is blocking a path it won't reroute navigation to a different path far away. See https://github.com/HaywireInteractive/OnAllFronts-Public/issues/1017 or screenshot below for more. Instead we could update NavMesh dynamically with all entities: https://dev.epicgames.com/documentation/en-us/unreal-engine/modifying-the-navigation-mesh-in-unreal-engine?application_version=5.3

• [ ] To enable dynamic modifiers: Go to Settings > Project Settings on the menu bar. Go to the Navigation Mesh settings and under the Runtime section, click the Runtime Generation dropdown. Select Dynamic Modifiers Only.
• [ ] See how UNavigationSystemV1::UpdateComponentInNavOctree updates the NavMesh. We should do something similar in a Mass processor every frame for all soldiers that have moved that frame.
• [ ] Verify on L_Template_CitySample_Small that this change doesn't tank the frame rate when you have lots of soldiers moving around
• [ ] FMassTargetGridCellLocationFragment.bDidEntityMoveThisFrame will tell you if entity moved this frame in the new processor, just make sure it's configured to run after UMassTargetGridProcessor (which sets bDidEntityMoveThisFrame).
• [ ] Verify if this change fixes BP_FunctionalTest_SimpleAvoidanceWithObstacles so that the moving soldiers will go around wall like expected path in screenshot below.

[Leroy231]

@Kizurou one other thing we should verify here: On L_Template_CitySample_Small ensure that this change doesn't tank the frame rate when you have lots of soldiers moving around. Also FMassTargetGridCellLocationFragment.bDidEntityMoveThisFrame will tell you if entity moved this frame in the new processor, just make sure it's configured to run after UMassTargetGridProcessor (which sets bDidEntityMoveThisFrame).

[Leroy231]

@Kizurou I also added one more subtask to the description: Verify if this change fixes BP_FunctionalTest_SimpleAvoidanceWithObstacles so that the moving soldiers will go around wall like expected path in screenshot below.