Don't time out on large commits

Report: https://about.gitlab.com/2016/01/15/making-gitlab-better-for-large-open-source-projects/#comment-2464883207

nrclark/dummy_project@81ebdea5 gives net/http: timeout awaiting response headers

I expect to at least see the page load without error.

/cc @dzaporozhets @yorickpeterse @jacobvosmaer @JobV

Zendesk issue: https://gitlab.zendesk.com/agent/tickets/15677