.github: Add the merge_group trigger for the e2e suite (#10760)

Signed-off-by: timflannagan <[email protected]>

Author: timflannagan

.github/workflows/pr-kubernetes-tests.yaml

@@ -2,6 +2,8 @@ name: Kubernetes Tests
 on:
   pull_request:
     types: [opened, synchronize, reopened, ready_for_review]
+  merge_group:
+    types: [checks_requested]
 
 env:
   VERSION: '1.0.0-ci1'