Create E2E test to generate an MR summary
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=460809) </details> <!--IssueSummary end--> Test the `Summarize Code Changes` feature to ensure feature is working correctly from an end to end point of view. Test will need to be executed in a live environment to integrate with a AI provider. ![Screenshot_2024-05-08_at_15.50.32](/uploads/993f39cbd49ccee2d3a4e3f211ea5182/Screenshot_2024-05-08_at_15.50.32.png) Related feedback issue: https://gitlab.com/gitlab-org/gitlab/-/issues/443236 Related AI gateway inteway integration issue https://gitlab.com/gitlab-org/gitlab/-/issues/459868 TODO: need to confirm whether the current form of the feature will be the GA feature Note: to enable feature in GDK, group needs to be ultimate: ![Screenshot_2024-05-14_at_13.06.54](/uploads/5f305d81fec27e63581c969a6feec87e/Screenshot_2024-05-14_at_13.06.54.png)
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