fix(driver): allow undefined extensions key in Magento graphql responses

In Magento versions that support GraphQl prior to v2.4.6 there was a key errors
called "extensions" that contained an error code indicating what kind of error you received.
For whatever reason, in v2.4.6 they removed this.

Once you upgrade to v2.4.6 you will see errors like `Cannot read properties of undefined (reading 'category')` as a result.

libs/driver/magento/src/errors/transform-graphql.spec.ts

@@ -1,5 +1,3 @@
-import { ApolloError } from '@apollo/client/core';
-
 import {
   DaffError,
   DaffErrorCodeMap,
@@ -60,6 +58,12 @@ describe('@daffodil/driver/magento | daffMagentoTransformGraphQlError', () => {
   });
 
   it('should not crash if the extension is not defined', () => {
+    const { extensions, ...error } = unhandledGraphQlError;
+    expect(() => daffMagentoTransformGraphQlError(error, map)).not.toThrow();
+    expect(daffMagentoTransformGraphQlError(error, map)).toEqual(new DaffDriverMagentoError('An error we don\'t handle'));
+  });
+
+  it('should not crash if there are no extensions defined', () => {
     const error = { ...unhandledGraphQlError, extensions: {}};
     expect(() => daffMagentoTransformGraphQlError(error, map)).not.toThrow();
   });

libs/driver/magento/src/errors/transform-graphql.ts

@@ -11,7 +11,7 @@ export function daffMagentoTransformGraphQlError<T extends DaffErrorCodeMap>(
   error: GraphQLError,
   map: T,
 ): DaffError {
-  const ErrorClass = map[error.extensions.category] || DaffDriverMagentoError;
+  const ErrorClass = map[error?.extensions?.category] || DaffDriverMagentoError;
 
   return new ErrorClass(error.message) ;
 };