[#20421] xCluster: Fix SysXClusterOutboundReplicationGroupEntryPB::NamespaceInfoPB name

Summary:
All PB messages must have PB suffix.

**Upgrade/Rollback safety:**
This PB is not yet in use. It is guarded under gflag `TEST_enable_xcluster_api_v2`

Jira: DB-9414

Test Plan: Jenkins

Reviewers: jhe, xCluster

Reviewed By: jhe

Subscribers: ybase, bogdan

Differential Revision: https://phorge.dev.yugabyte.com/D32880

Author: hari90

src/yb/master/catalog_entity_info.proto

@@ -821,7 +821,7 @@ message SysXClusterOutboundReplicationGroupEntryPB {
   // Namespace Id -> NamespaceInfoPB
   map<string, NamespaceInfoPB> namespace_infos = 1;
 
-  message TargetUniverseInfo {
+  message TargetUniverseInfoPB {
     required bytes universe_uuid = 1;
 
     enum State {
@@ -834,7 +834,7 @@ message SysXClusterOutboundReplicationGroupEntryPB {
     optional AppStatusPB error_status = 3; // Set when status is FAILED
   }
 
-  optional TargetUniverseInfo target_universe_info = 2;
+  optional TargetUniverseInfoPB target_universe_info = 2;
 
   enum State {
     READY = 0;

src/yb/master/xcluster/xcluster_outbound_replication_group-test.cc

@@ -452,7 +452,7 @@ TEST_F(XClusterOutboundReplicationGroupMockedTest, CreateTargetReplicationGroup)
   ASSERT_EQ(pb.target_universe_info().universe_uuid(), kTargetUniverseUuid.ToString());
   ASSERT_EQ(
       pb.target_universe_info().state(),
-      SysXClusterOutboundReplicationGroupEntryPB::TargetUniverseInfo::CREATING_REPLICATION_GROUP);
+      SysXClusterOutboundReplicationGroupEntryPB::TargetUniverseInfoPB::CREATING_REPLICATION_GROUP);
 
   EXPECT_CALL(*remote_client, IsSetupUniverseReplicationDone(_))
       .WillOnce(Return(IsOperationDoneResult::Done(STATUS(IllegalState, error_str))));
@@ -480,7 +480,7 @@ TEST_F(XClusterOutboundReplicationGroupMockedTest, CreateTargetReplicationGroup)
   ASSERT_EQ(pb.target_universe_info().universe_uuid(), kTargetUniverseUuid.ToString());
   ASSERT_EQ(
       pb.target_universe_info().state(),
-      SysXClusterOutboundReplicationGroupEntryPB::TargetUniverseInfo::REPLICATING);
+      SysXClusterOutboundReplicationGroupEntryPB::TargetUniverseInfoPB::REPLICATING);
 }
 
 TEST_F(XClusterOutboundReplicationGroupMockedTest, AddTable) {

src/yb/master/xcluster/xcluster_outbound_replication_group.cc

@@ -15,7 +15,6 @@
 #include "yb/client/xcluster_client.h"
 #include "yb/master/catalog_entity_info.h"
 #include "yb/master/xcluster/xcluster_outbound_replication_group_tasks.h"
-#include "yb/master/xcluster_rpc_tasks.h"
 #include "yb/util/is_operation_done_result.h"
 #include "yb/util/status_log.h"
 
@@ -570,7 +569,7 @@ Status XClusterOutboundReplicationGroup::CreateXClusterReplication(
 
   target_universe_info->set_universe_uuid(target_uuid.ToString());
   target_universe_info->set_state(
-      SysXClusterOutboundReplicationGroupEntryPB::TargetUniverseInfo::CREATING_REPLICATION_GROUP);
+      SysXClusterOutboundReplicationGroupEntryPB::TargetUniverseInfoPB::CREATING_REPLICATION_GROUP);
 
   RETURN_NOT_OK(Upsert(l, epoch));
 
@@ -590,13 +589,13 @@ Result<IsOperationDoneResult> XClusterOutboundReplicationGroup::IsCreateXCluster
   auto& target_universe = *outbound_group.mutable_target_universe_info();
 
   if (target_universe.state() ==
-      SysXClusterOutboundReplicationGroupEntryPB::TargetUniverseInfo::REPLICATING) {
+      SysXClusterOutboundReplicationGroupEntryPB::TargetUniverseInfoPB::REPLICATING) {
     return IsOperationDoneResult::Done();
   }
 
   auto setup_result = IsOperationDoneResult::NotDone();
   if (target_universe.state() ==
-      SysXClusterOutboundReplicationGroupEntryPB_TargetUniverseInfo::FAILED) {
+      SysXClusterOutboundReplicationGroupEntryPB_TargetUniverseInfoPB::FAILED) {
     Status status;
     if (target_universe.has_error_status()) {
       status = StatusFromPB(target_universe.error_status());
@@ -620,7 +619,7 @@ Result<IsOperationDoneResult> XClusterOutboundReplicationGroup::IsCreateXCluster
 
   if (setup_result.status().ok()) {
     target_universe.set_state(
-        SysXClusterOutboundReplicationGroupEntryPB::TargetUniverseInfo::REPLICATING);
+        SysXClusterOutboundReplicationGroupEntryPB::TargetUniverseInfoPB::REPLICATING);
   } else {
     LOG_WITH_PREFIX(WARNING) << "Failed to create replication group on target cluster: "
                              << setup_result.status();