Rename TAG_NAME to VERSION so it's no longer ambiguous when running hack/publish-to-operator-hub.sh
Checkout awx-operator at VERSION with fetch-depth=0 so that `make print-PREV_VERSION` will be able to actually find previous tag
Previously it will use scripts from the release tag to do the release
If we have to fix up the scripts for any reason we would have to retag
This will allow us to modify the publishing script without having to retag the release.
