Improve terrain rendering when using globe projection

[ibesora]

This PR fixes #4792
When terrain is used we first render all layers on an offscreen framebuffer and then use it as a texture on the terrain.
When using globe in addition to terrain, the wrong matrix was being used so tiles were projected in the wrong place in the offscreen framebuffer. This fixes it on raster layers by using the mercator fallback matrix when rendering to the offscreen buffer. I'll tackle vector layers in another PR.
Note that there can be further improvements on terrain by using an orthographic projection when rendering to the offscreen buffer but I'll tackle that in another PR.

Launch Checklist

• Confirm your changes do not include backports from Mapbox projects (unless with compliant license) - if you are not sure about this, please ask!
• Briefly describe the changes in this PR.
• Link to related issues.
• Include before/after visuals or gifs if this PR includes visual changes.
• Write tests for all new functionality.
• Document any changes to public APIs.
• Post benchmark scores.
• Add an entry to CHANGELOG.md under the ## main section.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.56%. Comparing base (cacd433) to head (a983859).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4825      +/-   ##
==========================================
+ Coverage   90.51%   90.56%   +0.05%     
==========================================
  Files         265      265              
  Lines       38095    38098       +3     
  Branches     3194     3188       -6     
==========================================
+ Hits        34480    34503      +23     
+ Misses       2636     2624      -12     
+ Partials      979      971       -8     

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[HarelM]

I've added a few minor comments.
Don't forget to add a few render tests to make sure this behavior does not break in the future...

[HarelM]

Consider adding a unit test maybe, or another render test that show the issue better.
Otherwise, this is approved.

[ibesora]

I'll tackle vector layers in another PR.

This was merged via #4977