Update manifest.json to Turn of Networkpolicies

- Network policies are newly causing issues with the PFB export job (likely due to the new Calico deployment and how networkpolicies are managed). I am disabling networkpolicies until GPE-1273 is completed.

staging.gen3.biodatacatalyst.nhlbi.nih.gov/manifest.json

@@ -300,7 +300,7 @@
     "tier_access_level": "regular",
     "tier_access_limit": 50,
     "dispatcher_job_num": "10",
-    "netpolicy": "on",
+    "netpolicy": "off",
     "argocd": "true",
     "waf_enabled": "true",
     "pdb": "on",