CI: Run publishing steps only on OSS repo for main/version branches (#47315)

* Convert steps to run on OSS repo only

* Exclude versioned branches from publishing artifacts

* Change trigger -> when

* Add trigger to upload_* steps

* Add conditions to remaining steps

* Exclude release steps

* Bring back exclusion for release builds

scripts/drone/version.star

@@ -8,7 +8,4 @@ ver_mode = 'release-branch'
 def version_branch_pipelines():
     return release_pipelines(ver_mode=ver_mode, trigger={
         'ref': ['refs/heads/v[0-9]*'],
-        'repo': [
-          'grafana/grafana',
-        ],
     })