Do not process replication task when namespace is deleted (temporalio…

…#6892)

## What changed?
<!-- Describe what has changed in this PR -->
Do not process replication task when namespace is deleted
## Why?
<!-- Tell your future self why have you made these changes -->
We can ignore the replication if namespace in current status is in
deleted status.
## How did you test it?
<!-- How have you verified this change? Tested locally? Added a unit
test? Checked in staging env? -->
unit test
## Potential risks
<!-- Assuming the worst case, what can be broken when deploying this
change to production? -->
no risk
## Documentation
<!-- Have you made sure this change doesn't falsify anything currently
stated in `docs/`? If significant
new behavior is added, have you described that in `docs/`? -->
n/a
## Is hotfix candidate?
<!-- Is this PR a hotfix candidate or does it require a notification to
be sent to the broader community? (Yes/No) -->
yes

service/history/replication/executable_task.go

@@ -32,6 +32,7 @@ import (
 	"time"
 
 	commonpb "go.temporal.io/api/common/v1"
+	"go.temporal.io/api/enums/v1"
 	"go.temporal.io/api/serviceerror"
 	"go.temporal.io/server/api/adminservice/v1"
 	enumsspb "go.temporal.io/server/api/enums/v1"
@@ -593,6 +594,9 @@ func (e *ExecutableTaskImpl) GetNamespaceInfo(
 	}
 
 	e.namespace.Store(namespaceEntry.Name())
+	if namespaceEntry.State() == enums.NAMESPACE_STATE_DELETED {
+		return namespaceEntry.Name().String(), false, nil
+	}
 	shouldProcessTask := false
 FilterLoop:
 	for _, targetCluster := range namespaceEntry.ClusterNames() {

service/history/replication/executable_task_test.go

@@ -35,6 +35,7 @@ import (
 	"github.com/stretchr/testify/require"
 	"github.com/stretchr/testify/suite"
 	commonpb "go.temporal.io/api/common/v1"
+	"go.temporal.io/api/enums/v1"
 	"go.temporal.io/api/serviceerror"
 	"go.temporal.io/server/api/adminservice/v1"
 	"go.temporal.io/server/api/adminservicemock/v1"
@@ -665,6 +666,34 @@ func (s *executableTaskSuite) TestGetNamespaceInfo_Skip() {
 	s.False(toProcess)
 }
 
+func (s *executableTaskSuite) TestGetNamespaceInfo_Deleted() {
+	namespaceID := uuid.NewString()
+	namespaceName := uuid.NewString()
+	namespaceEntry := namespace.FromPersistentState(&persistence.GetNamespaceResponse{
+		Namespace: &persistencespb.NamespaceDetail{
+			Info: &persistencespb.NamespaceInfo{
+				Id:    namespaceID,
+				Name:  namespaceName,
+				State: enums.NAMESPACE_STATE_DELETED,
+			},
+			Config: &persistencespb.NamespaceConfig{},
+			ReplicationConfig: &persistencespb.NamespaceReplicationConfig{
+				ActiveClusterName: cluster.TestAlternativeClusterName,
+				Clusters: []string{
+					cluster.TestCurrentClusterName,
+					cluster.TestAlternativeClusterName,
+				},
+			},
+		},
+	})
+	s.namespaceCache.EXPECT().GetNamespaceByID(namespace.ID(namespaceID)).Return(namespaceEntry, nil).AnyTimes()
+
+	name, toProcess, err := s.task.GetNamespaceInfo(context.Background(), namespaceID)
+	s.NoError(err)
+	s.Equal(namespaceName, name)
+	s.False(toProcess)
+}
+
 func (s *executableTaskSuite) TestGetNamespaceInfo_Error() {
 	namespaceID := uuid.NewString()
 	s.namespaceCache.EXPECT().GetNamespaceByID(namespace.ID(namespaceID)).Return(nil, errors.New("OwO")).AnyTimes()