chore: mark multiplexed session unit test as required (#3061)

* chore: mark multiplexed session unit test as required

* mark java8 as required

Author: rahul2393

.github/sync-repo-settings.yaml

@@ -19,6 +19,8 @@ branchProtectionRules:
       - compile (8)
       - compile (11)
       - OwlBot Post Processor
+      - units-with-multiplexed-session (8)
+      - units-with-multiplexed-session (11)
   - pattern: 3.3.x
     isAdminEnforced: true
     requiredApprovingReviewCount: 1