Refactor GHAs so templates use `label-directory.json`

[t-will-gillis]

Fixes #7687 ### What changes did you make? - Refactored `check-labels.js` so that templates labeled with `Template Label Placeholder` will trigger a function to find labelKeys in the body comments and then convert these to labelNames. - Refactored `blank-issue-template.md` and `inactive-members.md` as example cases of how this will work. The remaining templates will be changed in a later issue. ### Why did you make the changes (we will use this info to test)? - Providing the supporting functionality so that templates will use labelKeys and reference the `label-directory.json`

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From your project repository, check out a new branch and test the changes.

git checkout -b t-will-gillis-refactor-gha-templates-labels-7687 gh-pages
git pull https://github.com/t-will-gillis/website.git refactor-gha-templates-labels-7687

[t-will-gillis]

The specific task to use label key values on the template files will be addressed in a future issue.