Keep the colorField markerSchema field when processing profiles in the gecko format

[fqueze]

Not sure how to share a 'gecko'-format profile to use with a deploy preview, but here's the result of processing one of these profiles: https://share.firefox.dev/4q1GF0B

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.69%. Comparing base (0dd124f) to head (9227b28).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5760      +/-   ##
==========================================
+ Coverage   85.67%   85.69%   +0.02%     
==========================================
  Files         315      315              
  Lines       31110    31117       +7     
  Branches     8472     8474       +2     
==========================================
+ Hits        26654    26667      +13     
+ Misses       4026     4020       -6     
  Partials      430      430              

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