chore: mark native image checks as required (#902)

Author: mpeddada1

.github/sync-repo-settings.yaml

@@ -38,6 +38,8 @@ branchProtectionRules:
     - "Kokoro - Test: Integration"
     - "cla/google"
     - OwlBot Post Processor
+    - 'Kokoro - Test: Java GraalVM Native Image'
+    - 'Kokoro - Test: Java 17 GraalVM Native Image'
 
 # Identifies the protection rule pattern. Name of the branch to be protected.
 # Defaults to `main`