EmotionFX: Ability for SimpleMotionComponent & AnimGraphComponent to exist on same entity

[rossbridger]

What does this PR do?

This PR is a revival of aws/lumberyard#540, I revived it so that I can play an animation clip on the editor without having to disable or enable the simple motion component.

How was this PR tested?

Manually tested

[nick-l-o3de]

Looks like a test may need to be updated - maybe the test is no longer valid?

[2025-08-14T16:54:15.809Z] [----------] 1 test from CanAddSimpleMotionComponentFixture
[2025-08-14T16:54:15.809Z] [ RUN      ] CanAddSimpleMotionComponentFixture.CanAddSimpleMotionComponent
[2025-08-14T16:54:15.809Z] /data/workspace/o3de/Gems/EMotionFX/Code/Tests/Integration/CanAddSimpleMotionComponent.cpp:85: Failure
[2025-08-14T16:54:15.809Z] Value of: isActive
[2025-08-14T16:54:15.809Z]   Actual: true
[2025-08-14T16:54:15.809Z] Expected: false
[2025-08-14T16:54:15.809Z] 
[2025-08-14T16:54:15.809Z] [  FAILED  ] CanAddSimpleMotionComponentFixture.CanAddSimpleMotionComponent (331 ms)
[2025-08-14T16:54:15.809Z] [----------] 1 test from CanAddSimpleMotionComponentFixture (331 ms total)

Please fix the test

1. set your "startup project" in visual studio, to the test module that this code is in.
2. hit the run button. (optionally, add --gtest_break_on_failure --gtest_filter=*CanAddSimpleMotion* to the debug options)

[nick-l-o3de]

What a terribly weird test!
The test was named CanAddSimpleMotionComponent and previously made sure the added component was not able to be active.