MM-45198: Migrate app/import and api4/import (#20799)

We migrate them to use logger context.

https://mattermost.atlassian.net/browse/MM-45198

```release-note
NONE
```

i18n/en.json

@@ -5015,10 +5015,6 @@
     "id": "app.import.import_user_teams.save_preferences.error",
     "translation": "Unable to save the team theme preferences"
   },
-  {
-    "id": "app.import.marshal.app_error",
-    "translation": "Unable to marshal response."
-  },
   {
     "id": "app.import.process_import_data_file_version_line.invalid_version.error",
     "translation": "Unable to read the version of the data import file."