Remove review-apps documentation from GitLab handbook

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Context

Part of Epic &19358 - Deprecate/Remove review-apps for gitlab-org/gitlab.

The handbook likely contains documentation about review-apps that needs to be removed or updated now that the feature is being deprecated.

Tasks

• Search handbook for review-apps references
• Identify pages that need to be updated or removed
• Update workflow documentation that mentions review-apps
• Remove runbooks related to review-apps (e.g., https://gitlab.com/gitlab-org/quality/engineering-productivity/team/-/blob/main/runbooks/review-apps.md)
• Update any team processes that reference review-apps
• Verify no broken links remain

Known References

• Runbook: https://gitlab.com/gitlab-org/quality/engineering-productivity/team/-/blob/main/runbooks/review-apps.md
• Rotating credentials: https://internal.gitlab.com/handbook/engineering/infrastructure/engineering-productivity/rotating-credentials/

Related

• Epic: &19358
• Related issue: #516171 (Audit access tokens)