Fix failing E2E N+1 pipelines

What does this MR do?

Logs out after creating an access token before running tests.

This avoids failures like in https://gitlab.com/gitlab-org/quality/performance/pipelines/80910234

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry for user-facing changes, or community contribution. Check the link for other scenarios.
• [-] Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content