fix: replace IntegrityError with ValidationError

tests/test_models.py

@@ -9,7 +9,6 @@
 
 from django.conf import settings
 from django.core.exceptions import ValidationError
-from django.db.utils import IntegrityError
 from django.test import TestCase
 
 from taxonomy.models import B2CJobAllowList, Industry, Job, JobPostings, SkillValidationConfiguration
@@ -751,10 +750,10 @@ def tearDown(self):
 
     def test_model_obj_creation_with_course_and_org(self):
         """
-        Verify that an `IntegrityError` is raised if user try to create a
+        Verify that an `ValidationError` is raised if user try to create a
         SkillValidationConfiguration with both course and organization.
         """
-        with pytest.raises(IntegrityError) as raised_exception:
+        with pytest.raises(ValidationError) as raised_exception:
             factories.SkillValidationConfigurationFactory(
                 course_key=self.courses[0].key,
                 organization=self.courses[0].key.split('+')[0]