[MISC] Revert COS agent lib (14/edge)

[dragomirp]

Issue

Metrics break using the latest charm lib

Solution

Revert to the last known good patch version (0.22)

Checklist

• I have added or updated any relevant documentation.
• I have cleaned any remaining cloud resources from my accounts.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.82%. Comparing base (58db20a) to head (867fb90).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1474   +/-   ##
=======================================
  Coverage   75.82%   75.82%           
=======================================
  Files          17       17           
  Lines        4430     4430           
  Branches      676      676           
=======================================
  Hits         3359     3359           
  Misses        838      838           
  Partials      233      233           

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