Now we can get object format name from git command line or from the
database repository table. Assume the column is right, we don't need to
read from git command line every time.
This also fixed a possible bug that the object format is wrong when
migrating a sha256 repository from external.
<img width="658" alt="image"
src="https://github.com/go-gitea/gitea/assets/81045/6e9a9dcf-13bf-4267-928b-6bf2c2560423">
(cherry picked from commit b79c30435f439af8243ee281310258cdf141e27b)
Conflicts:
routers/web/repo/blame.go
services/agit/agit.go
context
6905540088