Revert "Codesign: Versioning code to support older branches"

This reverts commit 9d172f007e.

Got a second thought and remembered why it was not done in the first place.
The issue here is that the server needs to communicate codesign result back
and that must happen within the new protocol. So if the client talks old
protocol it is possible to receieve data from it, but is not possible to
communicate result back to it.

build_files/buildbot/codesign/archive_with_indicator.py

@@ -76,15 +76,6 @@ class ArchiveState:
         except json.decoder.JSONDecodeError:
             raise ArchiveStateError('Error parsing JSON')
 
-        # NOTE: Compatibility code with older codesign code from times when client
-        # did not use JSON for the archive indicator. After all branches has codesign
-        # merged this code should be removed.
-        if type(object_as_dict) == int:
-            result = cls()
-            result.file_size = int(object_as_dict)
-            result.error_message = ''
-            return result
-
         return cls(**object_as_dict)
 
     @classmethod