Goal:

• The "rbac" feature of the observabilityclient will be handled by Aetos going forward. So the rbac functionality can be removed (the rbac class should stay as it'll be provided for use by other services, it just shouldn't be called form observabilityclient anymore).
• The --disable-rbac command line option should be deprecated for removal in future version of the observabilityclient and should be turned into a no-op option (it shouldn't do anything as rbac will be always disabled from observabilityclient pont of view)

Acceptance Criteria:

• --disable-rbac is deprecated
• rbac functionality execution is removed from observabilityclient
• rbac class is still there to be used by external services