Adds new github-default option for the --branch option
Only runs against the default branch, and only runs the scripts in the default-branch dir.
This is necessary because we don't control the default branch of some repos, and some of them are master or main, and some of them are for CMS 4 branches
Adds new scripts for adding issue/PR templates for docs repos and for non-docs repos
github-defaultoption for the--branchoptiondefault-branchdir.masterormain, and some of them are for CMS 4 branchesIssue