Fix the problem that patch upload fails of horizon due to python3-django upgrade

fb4c55d9ec
This commit disables FileField for uploading multiple files
directly and introduces a new method as a replacement.
the upgrade of python3-django from 2:2.2.28-1~deb11u1 to
2:2.2.28-1~deb11u2 includes this commit.
Replace FileField with MultipleFileField for uploading multiple files.
Refer to the method introduced in the commit to replace
the previous usage.

Test Plan
PASS: build-pkgs -c -p starlingx-dashboard && build-image
PASS: jenkins installation successfuly
PASS: upload a patch using Horizon Web interface successfully

Closes-Bug: 2042610

Change-Id: I7bb4a0db7621922e5f1c8811ec3f49be4a37d1a5
Signed-off-by: Wentao Zhang <wentao.zhang@windriver.com>

starlingx-dashboard/starlingx-dashboard/starlingx_dashboard/dashboards/admin/software_management/forms.py

@@ -6,7 +6,7 @@
 
 import logging
 
-from django.forms import FileInput
+from django.forms import FileField, FileInput
 from django.urls import reverse  # noqa
 from django.utils.translation import ugettext_lazy as _
 
@@ -17,14 +17,25 @@ from starlingx_dashboard import api as stx_api
 
 LOG = logging.getLogger(__name__)
 
-
 class MultipleFileInput(FileInput):
     allow_multiple_selected = True
 
+class MultipleFileField(FileField):
+    def __init__(self, *args, **kwargs):
+        kwargs.setdefault("widget", MultipleFileInput())
+        super().__init__(*args, **kwargs)
+
+    def clean(self, data, initial=None):
+        single_file_clean = super().clean
+        if isinstance(data, (list, tuple)):
+            result = [single_file_clean(d, initial) for d in data]
+        else:
+            result = single_file_clean(data, initial)
+        return result
 
 class UploadPatchForm(forms.SelfHandlingForm):
     failure_url = 'horizon:admin:software_management:index'
-    patch_files = forms.FileField(label=_("Patch File(s)"),
+    patch_files = MultipleFileField(label=_("Patch File(s)"),
                                   widget=MultipleFileInput(attrs={
                                       'data-source-file': _('Patch File(s)'),
                                       'multiple': "multiple"}),