feat: add legacy tag deprecated components (#7142)

add legacy tag

src/backend/base/langflow/components/processing/alter_metadata.py

@@ -9,6 +9,7 @@ class AlterMetadataComponent(Component):
     description = "Adds/Removes Metadata Dictionary on inputs"
     icon = "merge"
     name = "AlterMetadata"
+    legacy = True
 
     inputs = [
         HandleInput(

src/backend/base/langflow/components/processing/json_cleaner.py

@@ -14,7 +14,7 @@ class JSONCleaner(Component):
         "Cleans the messy and sometimes incorrect JSON strings produced by LLMs "
         "so that they are fully compliant with the JSON spec."
     )
-
+    legacy = True
     inputs = [
         MessageTextInput(
             name="json_str", display_name="JSON String", info="The JSON string to be cleaned.", required=True