Change default TLS termination for cluster ArgoCD instance to reencrypt

Source: https://github.com/redhat-developer/gitops-operator/issues/297

Description

When the gitops-operator is installed, by default the cluster ArgoCD instance uses self-signed certificates which can be an unexpected user experience if the default ingress router certificates are signed by a trusted CA. In the past I think this was necessary because the gitops-operator did not support the other kinds of ingress TLS termination (edge, reencrypt) but now that it does we should look at changing this default behavior.

Describe the solution you'd like
The gitops-operator's gitopsservice controller should reconcile the default cluster ArgoCD instance to set the route TLS termination to reencrypt:
spec:
server:
route:
enabled: true
tls:
termination: reencypt{{}}
Describe alternatives you've considered
It is possible to manually change the ArgoCD spec after installation and set this but since the operator "owns" the ArgoCD instance ideally it should be done there.