[COST-5373] document downstream konflux flow

[djnakabaale]

COST-5373 - 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 79.79%. Comparing base (9ca0eeb) to head (5b0c589).
Report is 1 commits behind head on downstream.

Additional details and impacted files

@@             Coverage Diff             @@
##           downstream     #527   +/-   ##
===========================================
  Coverage       79.79%   79.79%           
===========================================
  Files              22       22           
  Lines            3464     3464           
===========================================
  Hits             2764     2764           
  Misses            596      596           
  Partials          104      104           

Flag	Coverage Δ
unittests	79.79% <ø> (ø)

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[bacciotti]

I've just added a single comment. Definitely not a blocker. Great work!