Fix comparison error when replace (#3941)

ADO: 33519015

What I did
Ignore the backend table when replace.

How I did it
Remove table tcomparison in config replace

How to verify it
Unit test

Author: wen587

generic_config_updater/generic_updater.py

@@ -181,6 +181,8 @@ def replace(self, target_config):
 
         self.logger.log_notice("Verifying config replacement is reflected on ConfigDB.")
         new_config = self.config_wrapper.get_config_db_as_json()
+        self.patch_applier.changeapplier.remove_backend_tables_from_config(target_config)
+        self.patch_applier.changeapplier.remove_backend_tables_from_config(new_config)
         if not (self.patch_wrapper.verify_same_json(target_config, new_config)):
             raise GenericConfigUpdaterError(f"After replacing config, there is still some parts not updated")