Blob refactor: Display code owners info

What does this MR do and why?

Display the code owners section when viewing a blob

Note: changes in this MR is part of a bigger effort to refactor the blob viewer and is behind the refactor_blob_viewer feature flag.

Screenshots or screen recordings

before	after

How to set up and validate locally

1. Enable the refactor FF

   Feature.enable(:refactor_blob_viewer)

2. Create a CODEOWNERS file

3. Populate the CODEOWNERS file

4. Open a file that has codeowners

5. Notice the codeowners section

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #335378 (closed)