[che-auth] deploy with native authentication on Kubernetes

[sparkoo]

Is your task related to a problem? Please describe

After che-server is ready for native auth on Kubernetes (#20633), we need to deploy and configure all needed bits.

Describe the solution you'd like

All this applies to Kubernetes only (everything should be already in place for Openshift):

• Set all needed properties for che-server
• Don't deploy Keycloak when native auth
• Deploy upstream oauth2-proxy(https://github.com/oauth2-proxy/oauth2-proxy) and kube-rbac-proxy(https://github.com/brancz/kube-rbac-proxy) as part of che-gateway
• Openshift uses forks of oauth2-proxy and kube-rbac-proxy. Configurations might be slightly different -> verify and make necessary changes if needed

Describe alternatives you've considered

No response

Additional context

#20633
epic: #19182

[sparkoo]

fixed by eclipse-che/che-operator#1185