PYTHON-4834 Add __repr__ to IndexModel

- Review fixes

Author: aclark4life

test/test_operations.py

@@ -21,14 +21,7 @@
 
 
 class TestOperations(UnitTest):
-    """Test Operations module including methods:
-    _Op, _DeleteOp, _UpdateOp,
-    DeleteOne, DeleteMany,
-    InsertOne,
-    ReplaceOne,
-    UpdateOne, UpdateMany,
-    IndexModel,
-    SearchIndexModel"""
+    """Test the operations module.""" 
 
     def test_index_model_repr(self):
         # Based on examples in test_collection.py
@@ -37,7 +30,6 @@ def test_index_model_repr(self):
         self.assertRepr(
             IndexModel([("hello", DESCENDING), ("world", ASCENDING)], name="hello_world")
         )
-
         # Test all the kwargs
         self.assertRepr(IndexModel("name", name="name"))
         self.assertRepr(IndexModel("unique", unique=False))
@@ -53,7 +45,6 @@ def test_index_model_repr(self):
         self.assertRepr(IndexModel("collation", collation=Collation(locale="en_US")))
         self.assertRepr(IndexModel("wildcardProjection", wildcardProjection={"$**": 1}))
         self.assertRepr(IndexModel("hidden", hidden=False))
-
         # Test string literal
         self.assertEqual(repr(IndexModel("hello")), "IndexModel({'hello': 1}, name='hello_1')")
         self.assertEqual(