Need better user awareness when using LDA with duplicated scenes

Steps to repro:

1. Open the attached project and SampleScene scene;
2. Unpack the Directional light prefab;
3. Save a scene to the different location;
4. Open SampleScene scene;
5. Observe the light in prefab reverting to realtime.

Actual result:

There is no information available to user explaining why a light has been reverted to realtime.

See attached video.

Expected result:

There is a warning in the Console stating that an LDA has been re-linked to the newly saved scene. Alternatively, we could issue a popup window before saving the scene asking the user to accept that the LDA of the existing scene will now belong to the other scene after saving the changed initial scene.

Notes:

• Reproducible in Version 2023.1.0a1;
• Also reproducible in the dev. branch of this PR, addressing some of the prefab+LDA related issues.