This patch adds a haproxy deployment to the cluster, which allows to
mimic the haproxy setup outside the cluster. Making sure that traffic is
automatically redirected and works around the limitations of ingress
nginx, of limiting proxy protocol to a boolean for either all traffic or
for none.

This patch adds PDBs for all main deployments with a hardcoded
maxUnavailable 1. This should help to make sure that updates go smooth
and without major downtimes, as soon as at least 2 replicas are running,
while still not blocking cluster updates.

Furhter it makes the redis dependency optional, helping to replace the
integrated redis with a separate or external redis service.

This patch should make redis HA, which should eliminate another SPOF for
goharbor. This is the first usage for the new redis operator.

This patch provides some basic operator configs to get resource requests
and limits in place along with enabling the built-in operator monitoring

Currently 3.3.0 has a bug, where the CRDs contain templating that
doesn't work, resulting in failed installations.

References:
https://github.com/spotahome/redis-operator/issues/654
https://github.com/spotahome/redis-operator/pull/655