[python] remove stale uniqueItems tests

Pydantic 2 removed conlist(unique_items=True). The migration in
04fa53b kept OpenAPI arrays as lists because sets would lose ordering
and complicate JSON serialization, but left these tests behind.

The tests do not require an exception, so they normally pass after making
a Petstore request. They fail when that request produces an unrelated
response validation error. Remove them from the two Pydantic 2 samples;
the Pydantic 1 sample still exercises the supported validation.

Author: tamird

samples/openapi3/client/petstore/python-lazyImports/tests/test_api_validation.py

@@ -40,12 +40,6 @@ def setUpModels(self):
         self.pet.category = self.category
         self.pet.tags = [self.tag]
 
-    def test_set_param_validation(self):
-        try:
-            self.pet_api.find_pets_by_tags(["a", "a"])
-        except ValidationError as e:
-            self.assertTrue("the list has duplicated items" in str(e))
-
     def test_required_param_validation(self):
         try:
             self.pet_api.get_pet_by_id()  # type: ignore

samples/openapi3/client/petstore/python/tests/test_api_validation.py

@@ -40,12 +40,6 @@ def setUpModels(self):
         self.pet.category = self.category
         self.pet.tags = [self.tag]
 
-    def test_set_param_validation(self):
-        try:
-            self.pet_api.find_pets_by_tags(["a", "a"])
-        except ValidationError as e:
-            self.assertTrue("the list has duplicated items" in str(e))
-
     def test_required_param_validation(self):
         try:
             self.pet_api.get_pet_by_id()  # type: ignore