fix sn tmp file flush thread not running in unittest

unittest/sql/engine/basic/test_chunk_datum_store.cpp

@@ -183,6 +183,7 @@ public:
       tenant_ctx.set(tf_mgr);
 
       ObTenantEnv::set_tenant(&tenant_ctx);
+      SERVER_STORAGE_META_SERVICE.is_started_ = true;
     }
 
     cell_cnt_ = COLS;

unittest/sql/engine/basic/test_chunk_row_store.cpp

@@ -88,6 +88,7 @@ public:
       tenant_ctx.set(tf_mgr);
 
       ObTenantEnv::set_tenant(&tenant_ctx);
+      SERVER_STORAGE_META_SERVICE.is_started_ = true;
     }
 
     row_.count_ = COLS;

unittest/storage/backup/test_backup_index_merger.cpp

@@ -343,6 +343,7 @@ void TestBackupIndexMerger::SetUp()
   tenant_ctx.set(tf_mgr);
 
   ObTenantEnv::set_tenant(&tenant_ctx);
+  SERVER_STORAGE_META_SERVICE.is_started_ = true;
   inner_init_();
 }
 

unittest/storage/backup/test_backup_iterator.cpp

@@ -138,6 +138,7 @@ void TestBackupIndexIterator::SetUp()
   tenant_ctx.set(tf_mgr);
 
   ObTenantEnv::set_tenant(&tenant_ctx);
+  SERVER_STORAGE_META_SERVICE.is_started_ = true;
   inner_init_();
   ASSERT_EQ(OB_SUCCESS, bandwidth_throttle_.init(1024 * 1024 * 60));
 }

unittest/storage/backup/test_backup_macro_block_index_merger.cpp

@@ -214,6 +214,7 @@ void TestBackupMacroIndexMerger::SetUp()
   tenant_ctx.set(tf_mgr);
 
   ObTenantEnv::set_tenant(&tenant_ctx);
+  SERVER_STORAGE_META_SERVICE.is_started_ = true;
   inner_init_();
 }
 

unittest/storage/backup/test_backup_utils.cpp

@@ -282,6 +282,7 @@ void TestBackupExternalSort::SetUp()
   tenant_ctx.set(tf_mgr);
 
   ObTenantEnv::set_tenant(&tenant_ctx);
+  SERVER_STORAGE_META_SERVICE.is_started_ = true;
 }
 
 void TestBackupExternalSort::TearDown()

unittest/storage/blocksstable/test_block_manager.cpp

@@ -146,7 +146,7 @@ TEST_F(TestBlockManager, test_mark_and_sweep)
   EXPECT_EQ(OB_SUCCESS, tf_mgr->start());
   tenant_ctx.set(tf_mgr);
   ObTenantEnv::set_tenant(&tenant_ctx);
-
+  SERVER_STORAGE_META_SERVICE.is_started_ = true;
   ASSERT_EQ(0, OB_SERVER_BLOCK_MGR.block_map_.count());
 
   const int blk_cnt = 100;

unittest/storage/ddl/test_chunk_compact_store.cpp

@@ -224,7 +224,7 @@ void TestCompactChunk::SetUp()
   tf_mgr->get_sn_file_manager().page_cache_controller_.write_buffer_pool_.default_wbp_memory_limit_ = 40*1024*1024;
   EXPECT_EQ(OB_SUCCESS, tf_mgr->start());
   tenant_ctx.set(tf_mgr);
-
+  SERVER_STORAGE_META_SERVICE.is_started_ = true;
   ObTenantEnv::set_tenant(&tenant_ctx);
 }
 

unittest/storage/direct_load/test_direct_load_index_block_writer.cpp

@@ -174,6 +174,7 @@ void TestIndexBlockWriter::SetUp()
   tenant_ctx.set(tf_mgr);
 
   ObTenantEnv::set_tenant(&tenant_ctx);
+  SERVER_STORAGE_META_SERVICE.is_started_ = true;
 }
 
 void TestIndexBlockWriter::TearDown()