Monthly run of the CI build to make sure all rel branches are buildable

[arkalyanms]

Adding a monthly run of the CI build to make sure all rel branches are buildable

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.48%. Comparing base (bc8aca0) to head (d633dd2).
Report is 2 commits behind head on main.

❗ Current head d633dd2 differs from pull request most recent head 43aac77

Please upload reports for the commit 43aac77 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7316   +/-   ##
=======================================
  Coverage   96.47%   96.48%           
=======================================
  Files        1443     1443           
  Lines      345400   345400           
  Branches    11364    11364           
=======================================
+ Hits       333239   333252   +13     
+ Misses       9282     9270   -12     
+ Partials     2879     2878    -1     

[phil-allen-msft]

I think these changes are right, but you may want to adjust the date range before merge so we can get an attempt 'soon'.

[RikkiGibson]

should we just backport this PR to 17.6 and flow forward?