Add missing sky in diff results

[HarelM]

Launch Checklist

• Add sky to diff #517

Fixes #517 - Add setSky to diff results

• 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.
• Write tests for all new functionality.
• Document any changes to public APIs.
• Add an entry to CHANGELOG.md under the ## main section.

[HarelM]

When reviewing, use "hide whitespace".
The changes in the diff test file adds readability to tests.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2009ed9) 92.22% compared to head (18a38bd) 92.23%.
Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #518   +/-   ##
=======================================
  Coverage   92.22%   92.23%           
=======================================
  Files         100      100           
  Lines        4195     4197    +2     
  Branches     1202     1203    +1     
=======================================
+ Hits         3869     3871    +2     
  Misses        326      326           

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