fix pushing helm docs back to main

[sami-alajrami]

when helm chart is updated, CI attempts to push the updated docs back to main to release them later in the release workflow.

Currently, this fails due to branch protection. This PR switches to creating a PR and auto-merge it instead of a direct push.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f99157e) 74.90% compared to head (6fcb90d) 74.90%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #90   +/-   ##
=======================================
  Coverage   74.90%   74.90%           
=======================================
  Files         125      125           
  Lines        8252     8252           
=======================================
  Hits         6181     6181           
  Misses       1631     1631           
  Partials      440      440           

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