Improve metadata access performance

What does this MR do?

Access metadata directly from Object Storage

Previously we would pull the file, now, we just stream-it as needed from Object Storage. This also generalizes Gitlab::Ci::Trace::HttpIO into Gitlab::HttpIO.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Tests added for this feature/bug
• Conform by the code review guidelines
  • Has been reviewed by a Backend maintainer
• Conform by the merge request performance guides
• Conform by the style guides
• Conform by the database guides
• If you have multiple commits, please combine them into a few logically organized commits by squashing them
• Internationalization required/considered
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?