Remove duplicate "Add help-wanted issues to help wanted board" job

[banesullivan]

The .github/workflows/main.yml GitHub Actions workflow was identical to .github/workflows/add-help-wanted.yml and both have been actively running.

Quick PR to clean this up and remove the duplicate CI job

@lwasser, you added this in #159 -- curious if duplicating was intentional?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.27%. Comparing base (302d8b5) to head (4b2bceb).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #269   +/-   ##
=======================================
  Coverage   76.27%   76.27%           
=======================================
  Files          10       10           
  Lines         725      725           
  Branches       92       92           
=======================================
  Hits          553      553           
  Misses        162      162           
  Partials       10       10           

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[lwasser]

@banesullivan nope - definitely not intentional. I sometimes have so many different things to do I forget. THANK YOU for catching this and cleaning it up!!