mgr/dashboard: comment questionable suites out

mgr/dashboard: comment questionable suites out

We're currently facing some issues with our integration
tests. Because of that we agreed on commenting questionable
suites out to be able to run all other suites on open pull
requests.

'test_health' and 'test_perf_counters' are commented out
because they led to issues in relation to
https://tracker.ceph.com/issues/41538
As soon as the issue has been fixed, we need to re-add
these two suites again.

Signed-off-by: Tatjana Dehler <tdehler@suse.com>