codecov - exclude protobuf-generated sources from coverage analysis (#6268)

Ref: https://docs.codecov.com/docs/ignoring-paths

Author: pavoljuhas

codecov.yml

@@ -3,3 +3,6 @@ coverage:
     project:
       default:
         threshold: 0.1%
+
+ignore:
+  - "**/*_pb2.py"