Add stat to ToCommit function for speed (#21337)

Calls to ToCommit are very slow due to fetching diffs, analyzing files.
This patch lets us supply `stat` as false to speed fetching a commit
when we don't need the diff.

/v1/repo/commits has a default `stat` set as true now. Set to false to
experience fetching thousands of commits per second instead of 2-5 per
second.

routers/api/v1/repo/notes.go

@@ -69,7 +69,7 @@ func getNote(ctx *context.APIContext, identifier string) {
 		return
 	}
 
-	cmt, err := convert.ToCommit(ctx.Repo.Repository, ctx.Repo.GitRepo, note.Commit, nil)
+	cmt, err := convert.ToCommit(ctx.Repo.Repository, ctx.Repo.GitRepo, note.Commit, nil, true)
 	if err != nil {
 		ctx.Error(http.StatusInternalServerError, "ToCommit", err)
 		return