Fix RoutingTest redirect fail [#3586698]

Problem/Motivation

RoutingTest phpunit fail

Routing (Drupal\Tests\graphql\Kernel\DataProducer\Routing)
✘ Route load
┐
├ Drupal\redirect\Exception\RedirectLoopException: Redirect loop identified at /external-url for redirect 1
│
│ /builds/issue/graphql-3586684/web/modules/contrib/redirect/src/RedirectRepository.php:137
│ /builds/issue/graphql-3586684/src/Plugin/GraphQL/DataProducer/Routing/RouteLoad.php:93
│ /builds/issue/graphql-3586684/src/Plugin/GraphQL/DataProducer/DataProducerPluginBase.php:57
│ /builds/issue/graphql-3586684/tests/src/Traits/DataProducerExecutionTrait.php:36
│ /builds/issue/graphql-3586684/tests/src/Kernel/DataProducer/RoutingTest.php:86

Steps to reproduce

run phpunit tests

Proposed resolution

store different redirects in test

Remaining tasks

Merge request

Issue fork graphql-3586698

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