GitHub strikes again. Apparently the github.ref context variable only
contains the PR number if the workflow is triggered by "pull_request" so
since we just changed the trigger to "pull_request_target" the variable
no longer contains the PR number and is therefore not unique and can't be
used as a concurrency group id. We now use
`github.triggering_actor-github.head_ref`.
After careful review, we believe we can now use the "pull_request_target"
workflow trigger instead of "pull_request" which required a separate
privliged workflow to add labels and comments to PRs when they are submitted
or updated. This allows us to greatly streamline our workflows and remove
unneeded ones.
* The OnPRChanged workflow was...
* Renamed to OnPRCheck
* Changed to trigger on pull_request_target and the "recheckpr" label.
* Changed to simply call reusable workflows in asterisk-ci-actions.
* Changed to use better concurrency groups.
* The OnPRCPCheck and OnPRMergeApproved workflows were also...
* Changed to simply call reusable workflows in asterisk-ci-actions.
* Changed to use better concurrency groups.
* The NightlyTest and CreateDocs were also tweaked
