[Ops] Disable check types on_merge completely (#167293)

## Summary
The full typecheck would definitely fail on the on_merge job, and the
selective typecheck doesn't make much sense (if it was already through
that step in the PR.) so we're temporarily disabling this step
completely.

.buildkite/pipelines/on_merge.yml

@@ -154,18 +154,16 @@ steps:
         - exit_status: '-1'
           limit: 3
 
-  - command: .buildkite/scripts/steps/check_types_commits.sh
-    label: 'Check Types Commit Diff'
-    # TODO: Enable in #166813 after fixing types
-  # - command: .buildkite/scripts/steps/check_types.sh
-    # label: 'Check Types'
-    agents:
-      queue: n2-16-spot
-    timeout_in_minutes: 60
-    retry:
-      automatic:
-        - exit_status: '-1'
-          limit: 3
+#  TODO: Enable in #166813 after fixing types
+#  - command: .buildkite/scripts/steps/check_types.sh
+#    label: 'Check Types'
+#    agents:
+#      queue: n2-16-spot
+#    timeout_in_minutes: 60
+#    retry:
+#      automatic:
+#        - exit_status: '-1'
+#          limit: 3
 
   - command: .buildkite/scripts/steps/storybooks/build_and_upload.sh
     label: 'Build Storybooks'