Comment out schedule for snapshot in workflow

Comment out the scheduled cron job for snapshot.

Author: ipapandinas

.github/workflows/check-runtime-migration.yml

@@ -7,8 +7,8 @@ on:
   pull_request:
     types: [opened, synchronize, reopened, ready_for_review]
   # Take a snapshot at 5am when most SDK devs are not working.
-  schedule:
-    - cron: "0 5 * * *"
+  # schedule:
+  #  - cron: "0 5 * * *"
   merge_group:
   workflow_dispatch: