Remove bundled PostgreSQL, Redis, MinIO

Summary

In GitLab 19.0 the bundled PostgreSQL, Redis and MinIO must be removed from GitLab chart as announced in #6271.

Acceptance Criteria

• Bundled Redis/PostgreSQL/MinIO removed
• Related templates and values that handle defaulting to bundled Redis/PostgreSQL/MinIO removed
• Add upgrade check that fails if no external Redis/PostgreSQL/MinIO have been configured