Check active actions when listing animations

[keianhzo]

Description
We are currently only listing the tracks from NLA tracks for the object but the glTF exported docs state that:

An action will be exported if it is the active action on an object, or it is stashed to an NLA track (e.g. with the Stash or Push Down buttons in the Action Editor). Actions which are not associated with an object in one of these ways are not exported. If you have multiple actions you want to export, make sure they are stashed!

So in the case the user relies on just the active action, we are not showing it.

We should include both the active animation and the NLA track actions in the animations list.

To Reproduce
Steps to reproduce the behavior:

• Add an animation action to an object
• Add the Loop Animation component
• Click on the + button to show the available animations.

Expected behavior
The current object active animation show be in the list.

Screenshots

Additional context
https://discord.com/channels/498741086295031808/964183314674098276/1088114999014199346