fix: Correct positional args for write_to_markdown()

[zkoppert]

Pull Request

fixes #408

Proposed Changes

This pull request includes changes to the issue_metrics.py file to correct the functionality and and improve readability of the main function. The most important changes include passing through a previously mis-implemented environment variable, and updating the write_to_markdown function call to use the new variable hide_label_metrics and prevent future mistakes by using keyword arguments instead of positional.

Readiness Checklist

Author/Contributor

• If documentation is needed for this change, has that been included in this pull request
• run make lint and fix any issues that you have introduced
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Reviewer

• Label as either fix, documentation, enhancement, infrastructure, maintenance, or breaking