Add release/milestone workflows

- Add one full kick workflows for doing milestone or release.
- Use new central infra for all workflows
- Still keep old manual central workflows as we probably need
  those until branches are fixes to use new workflows for central.
- Separate artifactory build names so that we have unique ones
  for snapshot/milestone/release per branch as otherwise
  jfrog artifact download might be inaccurate.
- Use github environments to pause workflow for promotion and
  central sync to be able manually check that staged and released
  artifacts looks ok.
- Add tweaks to gradle build to ease switching to milestone, release
  or next dev version.

.github/workflows/central-sync-close.yml

@@ -15,8 +15,8 @@ jobs:
     # Request close promotion repo
     - uses: jvalkeal/nexus-sync@main
       with:
-        username: ${{ secrets.OSSRH_TOKEN_USERNAME }}
-        password: ${{ secrets.OSSRH_TOKEN_PASSWORD }}
+        username: ${{ secrets.OSSRH_S01_TOKEN_USERNAME }}
+        password: ${{ secrets.OSSRH_S01_TOKEN_PASSWORD }}
         staging-profile-name: ${{ secrets.OSSRH_STAGING_PROFILE_NAME }}
         staging-repo-id: ${{ github.event.inputs.stagedRepositoryId }}
         close: true