git: Don't call `git2::Repository::find_remote` for every blamed buffer (#44107)

We already store the remote URLs for `origin` and `upstream` in the
`RepositorySnapshot`, so just use that data. Follow-up to #44092.

Release Notes:

- N/A
d5ed9d3e3aCole Miller committed on 12/4/2025, 6:25:30 PM· committed by GitHubparent74a1b5d
11 files changedLine totals unavailable