Allow to store BuildTraceChunks on Object Storage

What does this MR do?

This makes us store build trace chunks on Object Storage if enabled. This is more cost-efficient than using Database, and reduces database load.

If Object Storage is not used, we fallback to database as our storage.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conform by the code review guidelines
  • Has been reviewed by a Backend maintainer
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

Close https://gitlab.com/gitlab-org/gitlab-ce/issues/45712