On open repository open common cat file batch and batch-check (#15667)

Use common git cat-file --batch and git cat-file --batch-check to
significantly reduce calls to git.
    
Signed-off-by: Andrew Thornton <art27@cantab.net>

modules/git/notes_nogogit.go

@@ -43,11 +43,18 @@ func GetNote(repo *Repository, commitID string, note *Note) error {
 	if err != nil {
 		return err
 	}
-	defer dataRc.Close()
+	closed := false
+	defer func() {
+		if !closed {
+			_ = dataRc.Close()
+		}
+	}()
 	d, err := ioutil.ReadAll(dataRc)
 	if err != nil {
 		return err
 	}
+	_ = dataRc.Close()
+	closed = true
 	note.Message = d
 
 	treePath := ""