fix: 1568 Fixing S3 Connection Building

* fixes s3 connection building, allowing us to wait for a short period
  of time to allow the secret for longhorn-system to be built on
  Harvester side

Resovles: fix/1568
See also: harvester#1568

harvester_e2e_tests/integrations/test_4_vm_backup_restore.py

@@ -121,6 +121,8 @@ def config_backup_target(api_client, conflict_retries, backup_config, wait_timeo
         f'Failed to update backup target to {backup_type} with {config}\n'
         f"API Status({code}): {data}"
     )
+    # sleeping to allow longhorn secret to be built on Harvester side
+    sleep(5)
 
     yield spec