[CPU Lightmapper] Account for ambient light settings when baking lights

[needleful]

This helps to address issue #56078, by checking for ambient light settings when the baked lightmap's using the "Scene" environment setting.
In my own game, this appears to match the environment lighting exactly.

[JFonS]

Looks great!

There's an issue with code formatting and CI is failing. You should run clang-format on your changes. You can read more about code style here. I recommend setting up the pre-commit hooks, so you automatically run all the style checks locally before every commit. All this is also explained in the docs.

Other than that, the two commits should be squashed into one. Here's a bit of documentation on why we prefer single commits and how to squash multiple commits into one by using interactive rebase.

[needleful]

Thanks. I'm not too familiar with the workflow. I've applied clang-format now. Hopefully it looks good

[JFonS]

Looks great.

[JFonS]

Merged! Thanks for your contribution :)