refactor: change import json to global

Author: Jobzi

time_tracker_api/activities/activities_model.py

@@ -1,5 +1,5 @@
 from dataclasses import dataclass
-
+import json
 from azure.cosmos import PartitionKey
 
 from commons.data_access_layer.cosmos_db import (
@@ -124,7 +124,6 @@ def find_all_from_blob_storage(
         if tenant_id_value is None:
             return []
 
-        import json
         fs = FileStream("storageaccounteystr82c5","tt-common-files")
         result = fs.get_file_stream(file_name)
         return list(map(function_mapper, json.load(result))) if result is not None else []