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 (98b5328) to head (b362390).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5760   +/-   ##
=======================================
  Coverage   85.69%   85.69%           
=======================================
  Files         316      316           
  Lines       31141    31141           
  Branches     8582     8574    -8     
=======================================
  Hits        26686    26686           
  Misses       4025     4025           
  Partials      430      430           

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