ING-1399: Check test not flaky in GHA

Author: Westwooo

.github/workflows/test.yml

@@ -56,6 +56,12 @@ jobs:
           SGTEST_CBCONNSTR: ${{ steps.start-cluster.outputs.node-ip }}
         run: go test -v $(go list ./... | grep -v /contrib/)
 
+      - name: Run Graceful Shutdown Test X 100
+        timeout-minutes: 60
+        env:
+          SGTEST_CBCONNSTR: ${{ steps.start-cluster.outputs.node-ip }}
+        run: go test ./gateway/test -run TestGatewayOps -v -testify.m TestGracefulShutdown -v -count 100 -timeout 60m
+
       - name: Collect couchbase logs
         timeout-minutes: 10
         if: failure()