Refactor GHA to add labels to templates

[t-will-gillis]

Overview

We are in the process of replacing all references to labels in our workflows from specifying a label name (labelName) to specifying a label key (labelKey) instead. (Refer to issues # 6454 and # 5205 for the history) We need to extend this to our templates as well.

Details

To accomplish this, the suggestion is to replace all labels with a single placeholder label on each template- Template Label or similar. When an issue is created from a template and this label is found, first it should be removed*** and then the correct labels should be applied to the template issue. ***Will need to confirm, but there is possibility that an infinite loop could occur unless the trigger label is removed immediately.

Action Items

• In issue-trigger.tml provide a workflow step similar to "Add-Feature-Branch-Comment" that checks whether the label == 'Template Label' and if so, runs a js script to replace this label with the correct set.
• Write the js script noted
• Prepare a reference file for making the subsititions
• Apply the correct labels
• Perform a test in your own repo that demonstrates that there is no change to the GHA's functionality after making the edits.

Resources/Instructions

• Refer to Hack for LA's GitHub Actions (current revision), especially Tips 6, 7, and 8, if you have not already created you personal environment for testing.
• How to Test GitHub Actions
• Additional Notes for GitHub Actions
• This issue is part of the epic # 6454