fix(comments): resolve ruff lint errors

Remove unused imports (urlencode, F) and fix import sort order in
test_v2.py.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

apps/comments/views.py

@@ -1,7 +1,6 @@
 from __future__ import annotations
 
 import logging
-from urllib.parse import urlencode
 
 import requests as http_requests
 from django.conf import settings
@@ -9,7 +8,7 @@ from django.contrib import messages
 from django.core.cache import cache
 from django.core.exceptions import ValidationError
 from django.db import IntegrityError
-from django.db.models import F, Prefetch
+from django.db.models import Prefetch
 from django.http import HttpResponse, JsonResponse
 from django.shortcuts import get_object_or_404, redirect, render
 from django.views import View