Add new global setting to control auto-upload of test reports (#3137)

* Add new global setting to control auto-upload of test reports

* Adds callback to attach a copy of the test report when printing

* Fix for all attachment API endpoints

- The AttachmentMixin must come first!
- User was not being set, as the custom 'perform_create' function was never called

* Remove duplicated UserSerializer

* display uploading user in attachment table

* Add unit test to check the test report is automatically uploaded

InvenTree/common/models.py

@@ -965,12 +965,19 @@ class InvenTreeSetting(BaseInvenTreeSetting):
         },
 
         'REPORT_ENABLE_TEST_REPORT': {
-            'name': _('Test Reports'),
+            'name': _('Enable Test Reports'),
             'description': _('Enable generation of test reports'),
             'default': True,
             'validator': bool,
         },
 
+        'REPORT_ATTACH_TEST_REPORT': {
+            'name': _('Attach Test Reports'),
+            'description': _('When printing a Test Report, attach a copy of the Test Report to the associated Stock Item'),
+            'default': False,
+            'validator': bool,
+        },
+
         'STOCK_BATCH_CODE_TEMPLATE': {
             'name': _('Batch Code Template'),
             'description': _('Template for generating default batch codes for stock items'),