Cleanup unintentional change in rB8a2270efc52a

Note that the whole thing need to be redone/properly fixed, but this is
a bit more complicated so for now fix in rB8a2270efc52a is 'good
enough'.

Fix T83046: Material change not updating in the link of an override.

Code was actually not applying any override operation over linked data.

Reasonn behind that was that if library file is saved with latest
override applied then this is not needed, since data saved for the
override in the lib file is already up to date.

But this is actually fully breaking in case someone update the lib file
of the lib file, without re-saving the libfile itself.

So now we alwaya apply overrides also on linked data.

Note that this will not fix the case where a resync is needed.

Fix T82452: Outliner: Cyclic "Original ID" panel in Data API.

I cannot think of any case where we'd want to show this pointer in UI
anyway, so just tag it with `PROP_HIDDEN`.

Cleanup: Typo in `print_default_info` function name.

Cleanup: remove useless cast.

Fix T82849: Assert When Unlinking "Edit Source" Text Data-block.

Simplify and sanitize handling of usercounts for Text IDs generated
trhough `BKE_text_load_ex`.

Revert "LibOverride: Add initial support for adding new NLA tracks."

This reverts commit dbe330318011c137fc09d6a238f9282c983dadbf.

LibOverride: Add initial support for adding new NLA tracks.

Also makes NLA tracks and strips overridable.

Most of the work was as usual checking operators and adding protections
against illegal operations in override context.

Differential Revision: https://developer.blender.org/D9611

Merge branch 'master' into experimental-build

Fix (unreported) bug in liboverride diffing code for collection item insertion.

In case we do not use names, code adding new insert operations in
collections was broken.

Not a proble in practice so far, since this case was not yet in use, but
will be soon with NLA overrides.