Great thanks to @oliverpool for figuring out the problem and proposing a
fix.
Regression of #28138
Incorrect hash causes the user's LFS files get all deleted when running
`doctor fix all`
(by the way, remove unused/non-standard comments)
Co-authored-by: Giteabot <teabot@gitea.io>
- Remove `ObjectFormatID`
- Remove function `ObjectFormatFromID`.
- Use `Sha1ObjectFormat` directly but not a pointer because it's an
empty struct.
- Store `ObjectFormatName` in `repository` struct
Refactor Hash interfaces and centralize hash function. This will allow
easier introduction of different hash function later on.
This forms the "no-op" part of the SHA256 enablement patch.
