Convert templates to new format - will work automagically on Feb 19

[deniseyu]

Why:

This PR fixes up the proposed YAML templates for Issue Forms. If you merge this PR into the branch janiceilene-patch-1, then merge that branch into main sometime after February 19, then things should start ✨ automagically working ✨

What's being changed:

Check off the following:

• I have reviewed my changes in staging. (look for the deploy-to-heroku link in your pull request, then click View deployment)
• For content changes, I have reviewed the localization checklist
• For content changes, I have reviewed the Content style guide for GitHub Docs.

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