Address Copilot review comments: fix diacritic test input and add Cobertura tool to ADO coverage task

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Abel Milash

.azdo/ci-pr.yaml

@@ -79,5 +79,6 @@ extends:
         - task: PublishCodeCoverageResults@2
           condition: succeededOrFailed()
           inputs:
+            codeCoverageTool: 'Cobertura'
             summaryFileLocation: '**/coverage.xml'
           displayName: 'Publish code coverage'

tests/unit/data/test_odata_internal.py

@@ -1492,7 +1492,7 @@ def test_normalize_non_string_returns_empty_string(self):
 
     def test_normalize_diacritics(self):
         """_normalize_picklist_label strips diacritics and lowercases."""
-        self.assertEqual(self.od._normalize_picklist_label("Actif"), "actif")
+        self.assertEqual(self.od._normalize_picklist_label("Åctíf"), "actif")
 
     def test_empty_inputs_return_none(self):
         """_optionset_map returns None for empty table/attr inputs."""