test(NODE-6011): Add modifyCollection helper to UTR (#4032)

Author: aditi-khare-mongoDB

Diff for: test/integration/crud/crud.spec.test.js

@@ -425,10 +425,6 @@ describe('CRUD spec v1', function () {
   }
 });
 
-// TODO(NODE-5998) - The Node driver UTR does not have a Collection.modifyCollection helper.
-const SKIPPED_TESTS = ['findOneAndUpdate document validation errInfo is accessible'];
 describe('CRUD unified', function () {
-  runUnifiedSuite(loadSpecTests(path.join('crud', 'unified')), ({ description }) =>
-    SKIPPED_TESTS.includes(description) ? `the Node driver does not have a collMod helper.` : false
-  );
+  runUnifiedSuite(loadSpecTests(path.join('crud', 'unified')));
 });

Diff for: test/tools/unified-spec-runner/operations.ts

@@ -896,6 +896,15 @@ operations.set('createSearchIndexes', async ({ entities, operation }) => {
   return collection.createSearchIndexes(models);
 });
 
+operations.set('modifyCollection', async ({ entities, operation }) => {
+  const db = entities.getEntity('db', operation.object);
+  const command = {
+    collMod: operation.arguments?.collection,
+    validator: operation.arguments?.validator
+  };
+  return db.command(command, {});
+});
+
 export async function executeOperationAndCheck(
   operation: OperationDescription,
   entities: EntitiesMap,