send_email: Remove unnecessary send_email_from_dict.

This was introduced in 8321bd3f92 to serve as a sort of drop-in
replacement for zerver.lib.queue.queue_json_publish, but its use has
been subsequently cut out (e.g. `9fcdb6c83ac5`).

Remote its last callsite.

zerver/lib/send_email.py

@@ -227,10 +227,6 @@ def send_email(
         raise EmailNotDeliveredException
 
 
-def send_email_from_dict(email_dict: Mapping[str, Any]) -> None:
-    send_email(**dict(email_dict))
-
-
 def send_future_email(
     template_prefix: str,
     realm: Realm,

zerver/worker/queue_processors.py

@@ -82,7 +82,7 @@ from zerver.lib.send_email import (
     EmailNotDeliveredException,
     FromAddress,
     handle_send_email_format_changes,
-    send_email_from_dict,
+    send_email,
     send_future_email,
 )
 from zerver.lib.timestamp import timestamp_to_datetime
@@ -613,13 +613,13 @@ class EmailSendingWorker(QueueProcessingWorker):
     @retry_send_email_failures
     def consume(self, event: Dict[str, Any]) -> None:
         # Copy the event, so that we don't pass the `failed_tries'
-        # data to send_email_from_dict (which neither takes that
+        # data to send_email (which neither takes that
         # argument nor needs that data).
         copied_event = copy.deepcopy(event)
         if "failed_tries" in copied_event:
             del copied_event["failed_tries"]
         handle_send_email_format_changes(copied_event)
-        send_email_from_dict(copied_event)
+        send_email(**copied_event)
 
 
 @assign_queue("missedmessage_mobile_notifications")