Use relative paths for schemas, instead of $id. Enables VScode validation. (#25251)

lib/python/qmk/json_schema.py

@@ -76,8 +76,13 @@ def compile_schema_store():
         if not isinstance(schema_data, dict):
             cli.log.debug('Skipping schema file %s', schema_file)
             continue
+
+        # `$id`-based references
         schema_store[schema_data['$id']] = schema_data
 
+        # Path-based references
+        schema_store[Path(schema_file).name] = schema_data
+
     return schema_store