renovate: when bumping grafana packages add release label

[jackw]

What this PR does / why we need it:
Without a release label on the PRs that bump plugin-e2e in the create-plugin package.json template we don't get updates for plugin-e2e trickling down to plugins which rely on create-plugin update to bump deps which can leave canary e2e tests in a broken state even after fixes have been merged.

This Pr adds the missing label to resolve the above issue.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

[github-actions]

Hello! 👋 This repository uses Auto for releasing packages using PR labels.

✨ This PR can be merged. It will not be considered when calculating future versions of the npm packages and will not appear in the changelogs.

[leventebalogh]

🚀

[sunker]

Hmm @jackw are you sure you can add labels to custom managers? I think you need to move the labels to the associated package rule (line 41-53), but I could be wrong.

[jackw]

Hmm @jackw are you sure you can add labels to custom managers? I think you need to move the labels to the associated package rule (line 41-53), but I could be wrong.

Thanks @sunker . You are correct!

npx --yes --package renovate -- renovate-config-validator
 INFO: Validating .github/renovate.json5
ERROR: Found errors in configuration
       "file": ".github/renovate.json5",
       "errors": [
         {
           "topic": "Configuration Error",
           "message": "Custom Manager contains disallowed fields: labels"
         }
       ]

I've moved it as suggested!

[sunker]

🚀

[sunker]

The comments are really helpful, thanks for doing this! Even though it's pretty self-explanatory perhaps you can add a comment also to the github actions rule (the last one)?

[hugohaggmark]

Fantastic work on adding those comments 🎉