feat(redfish): reduce rbac permission given to operator and kepler for handling secrets

[sthaha]

This PR

• removes the RBAC role provided to both operator and kepler.
• Condition now contains the namespace where redfish secret is expected to be present.
• reorgs the code to follow naming convention
• Uses ContainerIndex type to refer to a container in spec.containers
• Make Redfish test that failed with the follow error message more robust by waiting for controller to reconcile

  
  --- FAIL: TestKeplerInternal_ReconciliationWithRedfish (0.09s)
  panic: runtime error: index out of range [0] with length 0 [recovered]
      panic: runtime error: index out of range [0] with length 0