Added input validation to strip email object on post (#11351)

no issue

Removes post email relation from edit/add requests as we don't want to edit email object directly as part of post

core/server/api/canary/utils/validators/input/schemas/posts.json

@@ -159,6 +159,9 @@
                 },
                 "plaintext": {
                     "strip": true
+                },
+                "email": {
+                    "strip": true
                 }
             }
         },