Remove che server properties that are outdated

[l0rd]

Is your enhancement related to a problem? Please describe

In today documentation we mention dozens of configuration options (sourced directly from che-server properties file) that are not used anymore and are confusing for admins that may set them and won't understand why they don't have any effect.

Describe the solution you'd like

Review che.properties file and identify:

• properties that don't have any effect on a Che instance anymore and should be removed or hided in documentation
• properties that enabled some features that we don't have anymore and that we should provide in dashboard or DevWorkspace Operator

Describe alternatives you've considered

No response

Additional context

No response

[ibuziuk]

one of the subtask for this issue could be removing the PVC configuration on the che-server end [1] che.infra.kubernetes.pvc.strategy
Basically, with DWO in place che-server should not handle the PVC creation / configuration at all.

eclipse-che/che-operator#1442 (comment) cc: @AObuchow

[1] https://github.com/eclipse-che/che-server/blob/main/assembly/assembly-wsmaster-war/src/main/webapp/WEB-INF/classes/che/che.properties#L375-L392

[l0rd]

Downstream issue