Fix animation track subproperty hints

[RailKill]

Simple AnimationPlayer-related fixes:

• Check the property list first before showing the "no track hint warning" introduced by Add descriptive warning for animation track hint fails. #84129 so that it doesn't skip subproperties.
• Only apply fix introduced by Fix errors when creating bezier component tracks. #96789 to bezier track types, because this fix removes the subproperty from the path which is needed for bezier tracks but causes a bug for normal value track types with subproperties.

Bugsquad edit: Fixes #99115 Fixes #102130

[kleonc]

Seems like this should fix #99115/#102130/#104964.

[KoBeWi]

Works correctly.

[fire]

I would like to ask the animation team to check

[TokageItLab]

Need to squash to follow PR workflow.

[akien-mga]

Need to squash to follow PR workflow.

We can squash before merge if needed, but a @godotengine/animation team review to confirm whether the fix is correct would be good.

Worth noting that #106491 was just opened, taking a different approach.

This PR (#104867) seems maybe less hacky but I'm not very familiar with the issue at hand.

[TokageItLab]

We concluded that the #102130 (comment) approach should be adopted to solve the original problem in animation teams meeting.

obj.get_indexed() should resolve everything,

[akien-mga]

Superseded by #106580. Thanks for the contribution!