logging_util: Remove dependence on get_current_request.

Pass the HttpRequest explicitly through the two webhooks that log to
the webhook loggers.

get_current_request is now unused, so remove it (in the same commit
for test coverage reasons).

Signed-off-by: Anders Kaseorg <anders@zulip.com>
(cherry picked from commit 63be67af80)

zerver/lib/logging_util.py

@@ -11,6 +11,7 @@ from typing import Optional, Tuple, Union
 import orjson
 from django.conf import settings
 from django.core.cache import cache
+from django.http import HttpRequest
 from django.utils.timezone import now as timezone_now
 
 
@@ -217,10 +218,8 @@ class ZulipWebhookFormatter(ZulipFormatter):
         return "\n".join(multiline)
 
     def format(self, record: logging.LogRecord) -> str:
-        from zerver.lib.request import get_current_request
-
-        request = get_current_request()
-        if not request:
+        request: Optional[HttpRequest] = getattr(record, "request", None)
+        if request is None:
             record.user = None
             record.client = None
             record.url = None