Add canCurrentUserPushToBranch permission

What does this MR do and why?

Updates the blob info graphQL query to include canCurrentUserPushToBranch

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

N/A

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

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 #335462 (closed)