testing(fixtures): add simple issue provider to config

Signed-off-by: David Wallace <david.wallace@tu-darmstadt.de>

Author: MyPyDavid

testing/fixtures/config.json

@@ -295,5 +295,38 @@
     "groups": [],
     "catalogs": []
   }
-}
+},
+  {
+    "model": "config.plugin",
+    "pk": 10,
+    "fields": {
+      "created": "2025-11-24T11:11:11:11Z",
+      "updated": "2025-11-24T11:11:11:11Z",
+      "uri": "http://example.com/terms/plugins/project/issue/provider/simple",
+      "uri_prefix": "http://example.com/terms",
+      "uri_path": "project/issue/provider/simple",
+      "url_name": "simple",
+      "comment": "",
+      "locked": false,
+      "order": 0,
+      "title_lang1": "URL Import",
+      "title_lang2": "",
+      "title_lang3": "",
+      "title_lang4": "",
+      "title_lang5": "",
+      "help_lang1": "",
+      "help_lang2": "",
+      "help_lang3": "",
+      "help_lang4": "",
+      "help_lang5": "",
+      "available": true,
+      "python_path": "plugins.project_issue_providers.providers.SimpleIssueProvider",
+      "plugin_type": "project_issue_provider",
+      "plugin_settings": {},
+      "sites": [],
+      "editors": [],
+      "groups": [],
+      "catalogs": []
+    }
+  }
 ]