Write minicluster unit test cluster dirs to target/mini-tests so CI keeps their logs

[DomGarguilo]

MiniAccumuloClusterClasspathTest has been hanging in github CI and timing out. Its logs are not saved as an artifact on timeout because the log dir is wiped before the CI can save it.

This PR moves the cluster dirs for the minitcluster tests into target/mini-tests via a small new helper so the logs are properly uploaded next time it hangs.

This also fixes an a small existing but where MiniAccumuloClusterClasspathTest was resuing MiniAccumuloClusterTest's directory name.

This doesn't fix the test hanging it will just give us more info next time it does hang.

[dlmarion]

I have definitely noticed this issue, but never really dug in. The parent pom sets java.io.tmpdir for both the surefire and failsafe plugins. The @TempDir should use that value. I wonder if it's not because the minicluster pom overrides the surefire plugin configuration there and java.io.tmpdir is not set.

[DomGarguilo]

I have definitely noticed this issue, but never really dug in. The parent pom sets java.io.tmpdir for both the surefire and failsafe plugins. The @TempDir should use that value. I wonder if it's not because the minicluster pom overrides the surefire plugin configuration there and java.io.tmpdir is not set.

I think the dir just gets cleared by the time the CI tries to upload the logs. I can't find it now but I saw an error along those line in the logs when i saw the timeout happen.

Edit: found it:

No files were found with the provided path: ./**/target/**/mini-tests/**/logs/. No artifacts will be uploaded.