zilencer: Remove management command for adding remote server.

As @timabbott mentioned on #20577, this command was mostly useful
during early development of the feature, and is no longer needed now
that we have an API for accomplishing the same thing.

zilencer/management/commands/add_remote_server.py

@@ -1,34 +0,0 @@
-from argparse import ArgumentParser
-from typing import Any
-
-from django.db import transaction
-
-from zerver.lib.management import ZulipBaseCommand
-from zilencer.models import RemoteZulipServer, RemoteZulipServerAuditLog
-
-
-class Command(ZulipBaseCommand):
-    help = """Add a remote Zulip server for push notifications."""
-
-    def add_arguments(self, parser: ArgumentParser) -> None:
-        group = parser.add_argument_group("command-specific arguments")
-        group.add_argument("uuid", help="the user's `zulip_org_id`")
-        group.add_argument("key", help="the user's `zulip_org_key`")
-        group.add_argument(
-            "--hostname", "-n", required=True, help="the hostname, for human identification"
-        )
-        group.add_argument("--email", "-e", required=True, help="a contact email address")
-
-    def handle(self, *args: Any, **options: Any) -> None:
-        with transaction.atomic():
-            remote_server = RemoteZulipServer.objects.create(
-                uuid=options["uuid"],
-                api_key=options["key"],
-                hostname=options["hostname"],
-                contact_email=options["email"],
-            )
-            RemoteZulipServerAuditLog.objects.create(
-                event_type=RemoteZulipServerAuditLog.REMOTE_SERVER_CREATED,
-                server=remote_server,
-                event_time=remote_server.last_updated,
-            )