change cognni pack to be certified (#10770)

Author: yaakovi

Packs/Cognni/pack_metadata.json

@@ -4,6 +4,7 @@
     "support": "partner",
     "currentVersion": "1.0.0",
     "author": "Cognni",
+    "certification": "certified",
     "url": "https://github.com/AVAILOTECH/x2o-demisto-content",
     "email": "vered@cognni.ai",
     "created": "2020-09-24T16:39:50Z",