Fix animation track inserted path and key type

[TokageItLab]

• Closes AnimationTrackEditor sub-property handling is not correct #99115
• Supersedes/Closes Fix animation track subpath hint inference. #106580

There are two issues with the current AnimationTrackEditor.

• The key type is incorrect
• The insertion path for the Bezier track is incorrect

To solve them:

• Adopt @YuriSizov 's suggestion regarding the acquisition of properties when inserting keys
• As with PR Fix animation track subpath hint inference. #106580, partially revert Fix errors when creating bezier component tracks. #96789
• Add a hack to prevent Bezier track try parsing sub-properties since in that case, the property variant always becomes a Nil, so we will use that. Since Bezier tracks do not display properties other than numerical properties in the property selection screen, this should not be a problem

[SaracenOne]

Thanks! Yes, I think this does indeed address the problems with my previous effort. I've closed the original and would recommend merging this now. 👍

[akien-mga]

Thanks!