Use the correct token for backport workflow

[akuzm]

The GITHUB_TOKEN variable is getting overwritten with the Github Actions
token.

Moreover, the token-based remote's credentials are somehow overwritten on push with credentials used for checkout action. Use the PAT for it as well.

This should finally let the backport script to update the outstanding backport PRs to the current target branch, and workflows to start for them.

Disable-check: force-changelog-file
Disable-check: approval-count

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.93%. Comparing base (59f50f2) to head (6af870a).
Report is 824 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7827      +/-   ##
==========================================
+ Coverage   80.06%   81.93%   +1.86%     
==========================================
  Files         190      249      +59     
  Lines       37181    46027    +8846     
  Branches     9450    11534    +2084     
==========================================
+ Hits        29770    37710    +7940     
- Misses       2997     3784     +787     
- Partials     4414     4533     +119     

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