EMSUSD-671 fix reloading scene with layers saved in the Maya scene #3518
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When reloading a scene that contained layers serialized directly in the scene, sub-layers would be lost because they were anonymous layers but on reload that status was lost and the sub-layer would be lost whenever the stage got recomputed.
Fix this by remembering that the sub-layer are anonymous on reload.
Add unit test to verify lost layer fix