Warn when output properties overlap for the same task

[lptr]

For example, the Test task seems to be recording the same outputs via two different properties since Gradle 4.7, meaning every output is recorded twice. (See https://github.com/gradle/build-cache/issues/1457)

We should warn when two properties point to the same place, or one property points to a parent of another.

[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.

[lptr]

Let's keep this open.

[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.

[wolfs]

Still relevant.