Add assignee to the docs update workflows

[danbarr]

Depends on stacklok/docs-website#443

Passes the username of the person whose push/tag triggered the CLI or Operator release along to the docs auto-update workflow, so it can assign the related docs PR.

Signed-off-by: Dan Barr 6922515+danbarr@users.noreply.github.com

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.18%. Comparing base (061030d) to head (ea44615).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3292      +/-   ##
==========================================
+ Coverage   64.11%   64.18%   +0.07%     
==========================================
  Files         365      365              
  Lines       35246    35246              
==========================================
+ Hits        22598    22623      +25     
+ Misses      10835    10809      -26     
- Partials     1813     1814       +1     

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