mgr/dashboard: fix orchestrator/02-hosts-inventory.e2e failed.

mgr/dashboard: fix orchestrator/02-hosts-inventory.e2e failed.

I removed the `02-hosts-inventory.e2e` file because it is a duplicate
test of one of the test in the `01-hosts.e2e` file and fixed the error
from that file.

Also, in the inventory Identify test, we test for an element to be not
visible. According to the latest cypress docs, this should be not.exist
instead of not.visible since the cd-modal will not even be present in
the DOM

Fixes: https://tracker.ceph.com/issues/53499
Signed-off-by: Nizamudeen A <nia@redhat.com>