Change Restart Policy in Backrest Job Template

The "restartPolicy" in the pgBackRest job template (backrest-job.json)
has been updated in both the Bash and Ansible installers from
"OnFailure" to "Never".  This aligns the restart policy for backrest
jobs with all other jobs created by the Operator, while also ensuring
the Job is properly run when using older versions of Kubernetes (e.g.
OCP 3.11).

Author: andrewlecuyer

ansible/roles/pgo-operator/files/pgo-configs/backrest-job.json

@@ -75,7 +75,7 @@
                         }
                     }]
                 }],
-                "restartPolicy": "OnFailure"
+                "restartPolicy": "Never"
             }
         }
     }

conf/postgres-operator/backrest-job.json

@@ -75,7 +75,7 @@
                         }
                     }]
                 }],
-                "restartPolicy": "OnFailure"
+                "restartPolicy": "Never"
             }
         }
     }