feat: global-state support for sky.*

[CommanderStorm]

Adds global state support for sky.*

As with previous runs, more tests for all of the interesting cases.
Renderer code is not a big deal imo, just plumbing.

This needs different scenes, because:

• fog only shows with terrain, not globe
• atmosphere only shows in globe
• sky in both

So a minimal testcase for each is a bit different, which is fine.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.36%. Comparing base (7dfd543) to head (b66332d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7967      +/-   ##
==========================================
- Coverage   93.37%   93.36%   -0.01%     
==========================================
  Files         288      288              
  Lines       24446    24446              
  Branches     6461     6461              
==========================================
- Hits        22827    22825       -2     
- Misses       1619     1621       +2     

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[HarelM]

I'll let you go over the other tests and see if you can remove calling methods on map object as part of the render tests.
The code change is straight forward.
We need to remember that render tests takes time to run and should be treated as e2e tests and not cover every possible code flow. For that we have unit tests.