ENH Roll out auto-tagging to all silverstripe/ repos and other supported modules

[GuySartorelli]

The approach is to check whether we have governance over the module, and if we don't, we skip checking the changes altogether.

We have governance over any module in the "silverstripe" github organisation, and over any supported branch of a supported module.

Examples

Ignore the CI failures in these examples - those are unrelated

• This shows a module we don't have governance over, because GuySartorelli/silverstripe-admin isn't supported at all.
  • https://github.com/GuySartorelli/silverstripe-admin/actions/runs/5732960801
• This shows a module we don't have governance over, because the branch isn't a supported branch.
  • Note that I added some temporary code to change GITHUB_REF_NAME from GuySartorelli/silverstripe-admin to silverstripe/silverstripe-admin), and to change GITHUB_REF_NAME to "3.9"
  • https://github.com/GuySartorelli/silverstripe-admin/actions/runs/5733118780
• This shows a module we do have governance over
  • Note that I added some temporary code to change GITHUB_REF_NAME from GuySartorelli/silverstripe-admin to silverstripe/silverstripe-admin)
  • https://github.com/GuySartorelli/silverstripe-admin/actions/runs/5733031837

Issue

• https://github.com/silverstripeltd/product-issues/issues/769

[GuySartorelli]

Requested changes made. I've run this through with a fork again just to be sure it's still doing what it's meant to at each branch of the conditions:

• Supported module: https://github.com/GuySartorelli/silverstripe-admin/actions/runs/5744451640/job/15570761399
• Not supported module: https://github.com/GuySartorelli/silverstripe-admin/actions/runs/5744466819/job/15570801952
• installer_version doesn't have a corresponding supported-modules branch: https://github.com/GuySartorelli/silverstripe-admin/actions/runs/5744507000/job/15570926291
• installer_version isn't semver: https://github.com/GuySartorelli/silverstripe-admin/actions/runs/5744568497/job/15571114287
• current branch isn't semver: https://github.com/GuySartorelli/silverstripe-admin/actions/runs/5744580015/job/15571148728

Note that for the above I spoofed the installer version, branch name, and module name as needed for the tests, but left the logic untouched. Note also that there are some small differences with the output of those examples than in the final PR - but all I have changed since running those is the echo statements so that won't affect anything vital, it still does the same things.