[COST-5373] document CMMO konflux flow

[djnakabaale]

COST-5373

Initial work to document konflux (build, test, release) flow for the cost management metrics operator.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.02%. Comparing base (c34ff25) to head (8e59cc1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #504   +/-   ##
=======================================
  Coverage   80.02%   80.02%           
=======================================
  Files          22       22           
  Lines        3464     3464           
=======================================
  Hits         2772     2772           
  Misses        590      590           
  Partials      102      102           

Flag	Coverage Δ
unittests	80.02% <ø> (ø)

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[maskarb]

This should go into the downtream since we aren't building main with konflux.

[djnakabaale]

close in favor of #527