Add successfulJobsHistoryLimit param to backups-restic addon (#4113)

Signed-off-by: Artiom Diomin <artiom@kubermatic.com>

Author: kron4eg

addons/backups-restic/backups-restic.yaml

@@ -26,7 +26,7 @@ spec:
   concurrencyPolicy: Forbid
   failedJobsHistoryLimit: 1
   schedule: '@every 30m'
-  successfulJobsHistoryLimit: 0
+  successfulJobsHistoryLimit: {{ default 1 .Params.successfulJobsHistoryLimit }}
   suspend: false
   jobTemplate:
     spec: