Make the lightmap render result affected by the WorldEnvironment.

[leiget]

I suggest the environment map should affect the result of the Lightmapper.

Godot version:
ea99b90

OS/device including version:
Doesn't matter.

Issue description:
The WorldEnvironment doesn't affect the render result of the BakedLightmap.

[reduz]

This will be fixed in 3.2 when the lightmapper is re-made:

[leiget]

Cool, thanks. Thanks for the cool engine.

[aaronfranke]

Has the lightmapper been remade in 3.2? I thought rendering changes will be done for 4.0?

[KoBeWi]

Can anyone still reproduce this bug in Godot 3.2.3 or any later release?

If yes, please ensure that an up-to-date Minimal Reproduction Project (MRP) is included in this report (a MRP is a zipped Godot project with the minimal elements necessary to reliably trigger the bug). You can upload ZIP files in an issue comment with a drag and drop.

[Calinou]

This is still the case in 3.2.3 – the lightmapper doesn't take the environment light into account. It will be fixed by #40035 once it's merged.

[JFonS]

Closing as fixed by #44628