fix: Build.result must be optional (#5338)

Co-authored-by: Camille Teruel <camille.teruel@meri.co>

Author: CamilleTeruel

backend/python/plugins/azuredevops/azuredevops/models.py

@@ -105,7 +105,7 @@ class BuildResult(Enum):
     start_time: Optional[datetime.datetime]
     finish_time: Optional[datetime.datetime]
     status: BuildStatus
-    result: BuildResult
+    result: Optional[BuildResult]
     source_branch: str
     source_version: str