Improve ingress patching

[jfaltermeier]

Is your feature request related to a problem? Please describe.

Currently the instances-ingress gets created/upgraded when running helm install/upgrade, but also gets patched by the operator if there are new appdefinitions or sessions.

This currently leads to quite some problems:
On helm upgrade we set the hosts to the same values we had before the upgrade, this will result in changed values not being applied (e.g. allWildcardInstances)
When upgrading a separate appDefinition helm chart added appDefinitions will not be updated in the ingress, hence they wont work.

This makes the upgrade process harder or even impossible. We should investigate on how we can improve this.

Describe the solution you'd like

One solution might be to handle the ingress completely by the operator.

Describe alternatives you've considered

Cluster provider

No response

Additional information

No response