Quick fix to reconfig maximumHandoverTimeoutSeconds (#7216)

## What changed?
<!-- Describe what has changed in this PR -->
Reconfig the maximumHandoverTimeoutSecondto 30s but change the actual
input to 10s for the default tests.

## Why?
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## How did you test it?
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test? Checked in staging env? -->

## Potential risks
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change to production? -->

## Documentation
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stated in `docs/`? If significant
new behavior is added, have you described that in `docs/`? -->

## Is hotfix candidate?
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service/worker/migration/handover_workflow.go

@@ -37,7 +37,7 @@ const (
 
 	minimumAllowedLaggingSeconds  = 5
 	maximumAllowedLaggingSeconds  = 120
-	maximumHandoverTimeoutSeconds = 10
+	maximumHandoverTimeoutSeconds = 30
 )
 
 type (

service/worker/migration/handover_workflow_test.go

@@ -62,7 +62,7 @@ func TestHandoverWorkflow(t *testing.T) {
 		Namespace:              "test-ns",
 		RemoteCluster:          "test-remote",
 		AllowedLaggingSeconds:  10,
-		HandoverTimeoutSeconds: 30,
+		HandoverTimeoutSeconds: 10,
 	})
 
 	require.True(t, env.IsWorkflowCompleted())

tests/xdc/failover_test.go

@@ -2700,7 +2700,7 @@ func (s *FunctionalClustersTestSuite) TestLocalNamespaceMigration() {
 		Namespace:              namespace,
 		RemoteCluster:          s.clusterNames[1],
 		AllowedLaggingSeconds:  10,
-		HandoverTimeoutSeconds: 30,
+		HandoverTimeoutSeconds: 10,
 	})
 	s.NoError(err)
 	err = run5.Get(testCtx, nil)