fix slack notifier open pulls

[ericbuckley]

Description

Fixing the slack notifier open pulls workflow to run on a schedule in main. The if: ${{ env.PR_LIST != '[]' }} comparison is too complex for a GH action step, we need to simplfy that a bit by doing more logic in the proceeding step.

<--------------------- REMOVE THE LINES BELOW BEFORE MERGING --------------------->

Checklist

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• I have ensured that the pull request is of a manageable size, allowing it to be reviewed within a single session.
• I have reviewed my changes to ensure they are clear, concise, and well-documented.
• I have updated the documentation, if applicable.
• I have added or updated test cases to cover my changes, if applicable.
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Checklist for Reviewers

Please review and complete the following checklist during the review process:

• The code follows best practices and conventions.
• The changes implement the desired functionality or fix the reported issue.
• The tests cover the new changes and pass successfully.
• Any potential edge cases or error scenarios have been considered.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.75%. Comparing base (cbe8c78) to head (e7af618).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #86   +/-   ##
=======================================
  Coverage   92.75%   92.75%           
=======================================
  Files          17       17           
  Lines         759      759           
=======================================
  Hits          704      704           
  Misses         55       55           

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