Update formatting/permissions/triggers for GH Actions #3109
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Which issue this PR addresses:
Follow up related to ARO-3957
What this PR does / why we need it:
This updates the formatting/permissions/triggers for our existing GitHub Actions to ensure they are secure and only have the minimum permissions they need.
The existing external GH actions we use are all allow-listed here: https://github.com/Azure/ARO-RP/settings/actions
Test plan for issue:
Green CI ==
Is there any documentation that needs to be updated for this PR?
No