e2e: remove cert-manager from test environments #2129
Description
The no-cert-manager Turtles feature has no test coverage with a cert-manager free environment.
Doing a clean install of Turtles without cert-manager would have found for example this issue: #2128
Since rancher/rancher tests also seem to be cert-manager free, it would be best to align.
Currently cert-manager should be only used to provide the Rancher self signed Issuer and certificate for the Ingress. This can be removed and replaced with a static long expiry certificate.
I believe it still makes sense to have some tests still include cert-manager, since it's most likely a common user scenario, so maybe a new suite can be built or just the short tests can be updated.