Refactor ls-tree and git path related problems (#35858)

Fix #35852, the root problem is that the "name" field is heavily abused
(since #6816, and no way to get a clear fix)

There are still a lot of legacy problems in old code.

Co-authored-by: Giteabot <teabot@gitea.io>

routers/web/repo/commit.go

@@ -415,6 +415,8 @@ func Diff(ctx *context.Context) {
 			ctx.ServerError("PostProcessCommitMessage", err)
 			return
 		}
+	} else if !git.IsErrNotExist(err) {
+		log.Error("GetNote: %v", err)
 	}
 
 	pr, _ := issues_model.GetPullRequestByMergedCommit(ctx, ctx.Repo.Repository.ID, commitID)