Creates deterministic ordering of features for experimenter manifest

[tarikeshaq]

fixes https://mozilla-hub.atlassian.net/browse/EXP-2184

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[codecov-commenter]

Codecov Report

Merging #4819 (87a16c4) into main (3151f8c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #4819   +/-   ##
=======================================
  Coverage   81.51%   81.51%           
=======================================
  Files          56       56           
  Lines        5663     5663           
=======================================
  Hits         4616     4616           
  Misses       1047     1047           

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[eliserichards]

Looks great! 🎉