mgr/dashboard: Refactoring dashboard cephadm checks

mgr/dashboard: Refactoring dashboard cephadm checks

I isolated all the tests suites into there respective files
so that in future it is easier to add more tests to it.

I also given priority to the host actions.

Create OSD checks are now written in a way that OSDs
are created only on the intended hosts. This will make
the host draining process easier and less time consuming.

Also tried to address the flaky force maintenance checks.

Removed some duplicated codes

Service creation part improved to reduce the time taken
for its completion

Fixes: https://tracker.ceph.com/issues/53905
Signed-off-by: Nizamudeen A <nia@redhat.com>