Update wg-pipelines-leads permissions (#810)

1. Add write access to relevant kfp repos
2. Set privacy to closed

Signed-off-by: Anish Asthana <anishasthana1@gmail.com>

Author: anishasthana

github-orgs/kubeflow/org.yaml

@@ -1200,7 +1200,10 @@ orgs:
             - HumairAK
             - mprahl
             - zazulam
-            privacy: open
+            privacy: closed
+            repos:
+              kfp-tekton: write
+              pipelines: write
           wg-training-leads:
             description: Team of Training Working Group leads
             members: