[Tech Debt] Follow up on helm-locker repo reorg

[mallardduck]

Moving the follow up actions into this issue from the original PR.

• Tag a v0.3.0 release here - which will release both images to GHCR
• Add package/helm-project-operator label to existing issues in this repo
• Shutdown usage of the helm-locker repo:
  • Move over the issues from helm-locker repo & label as package/helm-locker,
  • update helm-locker repo readme,
  • archive helm-locker repo, - created issue to track
• [n/a] Implement new branching strategy (maybe after Alex PR merge, need to decide optimal order)
  • Realized this is getting ahead of ourselves since we want to merge this codebase into prometheus-federator code base,
  • The goal to use new branching was slated for after that process completed and this was just the first half of that process.
  • For now we will do minimal dependency bumps keeping Rancher 2.8 as our target; this should keep these projects more updated and maintain compatability with all necessary k8s versions.
• [n/a] Rebuild Alex's PR to update helm-locker on this repo; will update both sets of dependencies at once.
  • I've realized a lot of the changes that happened since the PR was started supersede it,
  • At this point I think we'll forego that PR (reevaluate later to decide if needed at all or if we close it),
• Update prometheus-federator to use patched versions of this repo,
  • Pending PR: helm-project-operator and helm-locker repo reorg updates prometheus-federator#93
• [n/a] subsequently ensure rancher-monitoring and rancher-project-monitoring are updated and in charts

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This PR's n/a steps will be followed up on later in rancher/prometheus-federator#109 or other work in the prom-fed repo.

[mallardduck]

Having created an initial 0.3.0 tag, i'm working on the prometheus-federator PR to use the new repo structure now. Last time I worked on it I was able to make some progress fixing CI issues there. However ran out of time on friday so I will get back to that task this week.

[mallardduck]

New release with CI fixes that were needed: https://github.com/rancher/helm-project-operator/releases/tag/v0.3.1

[mallardduck]

PR to update Prom Federator here: rancher/prometheus-federator#95

[mallardduck]

Closing as superseded by rancher/prometheus-federator#109