Store the results in our directory instead of /var/tmp

Adjust where the reports are stored when running the benchmarks and
where the reports are read from.

Instead of /var/tmp, use cl-bench/results.  This will make it easier
to find these files in CI.
2 jobs for rtoy-issue-87-add-cl-bench in 11 minutes and 43 seconds (queued for 1 second)
Status Name Job ID Coverage
  Test
passed linux-runner #4251
linux

00:06:45

passed osx-runner #4252
osx

00:11:41