fix attachment file size limit in server backend (#35519)

fix #35512

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

modules/git/utils.go

@@ -6,7 +6,6 @@ package git
 import (
 	"crypto/sha1"
 	"encoding/hex"
-	"io"
 	"strconv"
 	"strings"
 	"sync"
@@ -68,32 +67,6 @@ func ParseBool(value string) (result, valid bool) {
 	return intValue != 0, true
 }
 
-// LimitedReaderCloser is a limited reader closer
-type LimitedReaderCloser struct {
-	R io.Reader
-	C io.Closer
-	N int64
-}
-
-// Read implements io.Reader
-func (l *LimitedReaderCloser) Read(p []byte) (n int, err error) {
-	if l.N <= 0 {
-		_ = l.C.Close()
-		return 0, io.EOF
-	}
-	if int64(len(p)) > l.N {
-		p = p[0:l.N]
-	}
-	n, err = l.R.Read(p)
-	l.N -= int64(n)
-	return n, err
-}
-
-// Close implements io.Closer
-func (l *LimitedReaderCloser) Close() error {
-	return l.C.Close()
-}
-
 func HashFilePathForWebUI(s string) string {
 	h := sha1.New()
 	_, _ = h.Write([]byte(s))