Use commit sha for API calls on project view page

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Epic: &11540 (closed)

Problem

A project page (https://gitlab.com/gitlab-org/gitlab) uses a reference name for API requests.

Proposal

Resolve the reference name on page load and use the corresponding commit sha for API requests.

backend finds a default branch for the project and exposes both a reference name main and a commit sha aaaa to frontend.

frontend uses the reference name on UI and the commit sha for API requests.

backend

Support frontend with providing both reference name and resolved commit sha.

frontend

Modify affected requests to use commit sha as a ref:

• getPaginatedTree (GraphQL)
• pathLastCommit (GraphQL)
• Logs_tree request: https://gitlab.com/gitlab-org/gitlab/-/refs/master/logs_tree/?format=json&offset=0 (API)
• Readme request: https://gitlab.com/gitlab-org/gitlab/-/blob/master/README.md?format=json&viewer=rich (API)