mgr/cephadm: add --rm-crush-entry flag to host removal

mgr/cephadm: add --rm-crush-entry flag to host removal

This will tell cephadm to try and remove the
crush bucket for the host at the end of the host
removal process. If this fails, we still consider the
host as having been successfully remove from
cephadm's POV, but the user will get back an error
message telling them we failed to remove the
host from the crush map

Fixes: https://tracker.ceph.com/issues/63031
Signed-off-by: Adam King <adking@redhat.com>