[blob-service] Support new abstraction in HTTP

Summary:
Part of ENG-4269.

Propagated new blob service abstraction to HTTP code. Implemented error handling. Now all kinds of error responses can be handled in one place.

Depends on D8456.

Test Plan: Tested later in the stack

Reviewers: michal, varun, jon, patryk

Reviewed By: michal

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D8457