CBG-4444 create an env var override for bucket op timeout (#7259)

* CBG-4444 create an env var override for bucket op timeout

* increase timeout for tests

base/main_test_cluster.go

@@ -54,11 +54,11 @@ func newTestCluster(ctx context.Context, server string, tbp *TestBucketPool) *tb
 // getGocbClusterForTest makes cluster connection. Callers must close. Returns the cluster and the connection string used to connect.
 func getGocbClusterForTest(ctx context.Context, server string) (*gocb.Cluster, string) {
 
-	testClusterTimeout := 10 * time.Second
 	spec := BucketSpec{
-		Server:          server,
-		TLSSkipVerify:   true,
-		BucketOpTimeout: &testClusterTimeout,
+		Server:        server,
+		TLSSkipVerify: true,
+		// use longer timeout than DefaultBucketOpTimeout to avoid timeouts in test harness from using buckets after flush, which takes some time to reinitialize
+		BucketOpTimeout: Ptr(time.Duration(30) * time.Second),
 	}
 	connStr, err := spec.GetGoCBConnString()
 	if err != nil {