tests: Replace HttpResponse with TestHttpResponse.

Since `HttpResponse` is an inaccurate representation of the
monkey-patched response object returned by the Django test client, we
replace it with `_MonkeyPatchedWSGIResponse` as `TestHttpResponse`.

This replaces `HttpResponse` in zerver/tests, analytics/tests, coporate/tests,
zerver/lib/test_classes.py, and zerver/lib/test_helpers.py with
`TestHttpResponse`. Several files in zerver/tests are excluded
from this substitution.

This commit is auto-generated by a script, with manual adjustments on certain
files squashed into it.

This is a part of the django-stubs refactorings.

Signed-off-by: Zixuan James Li <p359101898@gmail.com>

zerver/tests/test_subs.py

@@ -2,7 +2,7 @@ import hashlib
 import random
 from datetime import timedelta
 from io import StringIO
-from typing import Any, Dict, List, Mapping, Optional, Sequence, Set, Union
+from typing import TYPE_CHECKING, Any, Dict, List, Mapping, Optional, Sequence, Set, Union
 from unittest import mock
 
 import orjson
@@ -105,6 +105,9 @@ from zerver.models import (
 )
 from zerver.views.streams import compose_views
 
+if TYPE_CHECKING:
+    from django.test.client import _MonkeyPatchedWSGIResponse as TestHttpResponse
+
 
 class TestMiscStuff(ZulipTestCase):
     def test_test_helper(self) -> None:
@@ -2378,7 +2381,7 @@ class StreamAdminTest(ZulipTestCase):
         target_users_subbed: bool = True,
         using_legacy_emails: bool = False,
         other_sub_users: Sequence[UserProfile] = [],
-    ) -> HttpResponse:
+    ) -> "TestHttpResponse":
 
         # Set up the main user, who is in most cases an admin.
         if is_realm_admin:
@@ -5676,7 +5679,7 @@ class GetSubscribersTest(ZulipTestCase):
 
     def make_subscriber_request(
         self, stream_id: int, user: Optional[UserProfile] = None
-    ) -> HttpResponse:
+    ) -> "TestHttpResponse":
         if user is None:
             user = self.user_profile
         return self.api_get(user, f"/api/v1/streams/{stream_id}/members")