Clean up stale local state files

[lptr]

Broken off from https://github.com/gradle/build-cache/issues/806:

Stale local state files should be cleaned up just like stale output files.

[stale]

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[lptr]

@wolfs is this still an issue?

[wolfs]

Yeah, we still need this.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. Given the limited bandwidth of the team, it will be automatically closed if no further activity occurs. If you're interested in how we try to keep the backlog in a healthy state, please read our blog post on how we refine our backlog. If you feel this is something you could contribute, please have a look at our Contributor Guide. Thank you for your contribution.