LightOccluder2D configuration warning not disappearing

[azuriancomet]

Tested versions

• Reproducible in: v4.3.stable.official [77dcf97], v4.4.beta3.official [06acfcc]

System information

Windows 11

Issue description

The node configuration warning doesn't disappear after correctly setting the Occluder, unless the project is restarted.

If the LightOccluder2D is the root node, it only disappears after saving the scene (not after setting the Occluder, as expected).

Steps to reproduce

1. Create a new project.
2. Create a new scene.
3. Add a Node.
4. Add a LightOccluder2D.
5. Create a new OccluderPolygon2D for the Occluder.
6. Draw a shape.
7. Save the scene.

Minimal reproduction project (MRP)

N/A since restarting the project fixed the bug.

[RedMser]

It seems like LightOccluder2D::set_occluder_polygon doesn't call update_configuration_warnings. Adding that should fix it. See #98637 which fixed part of this already.

unless the project is restarted.

Closing and re-opening scene (or switching active scene tab) also works.