billing: Delete add_server_to_legacy_plan in favor of support actions.

As we can now add a complimentary access plan (formerly legacy plan)
to a remote server or remote realm via the support view, we no
longer use or need this management command for our billing admin.

zilencer/management/commands/add_server_to_legacy_plan.py

@@ -1,62 +0,0 @@
-from datetime import datetime, timezone
-from typing import Any
-
-from django.core.management.base import CommandParser
-from django.utils.timezone import now as timezone_now
-from typing_extensions import override
-
-from corporate.lib.stripe import RemoteServerBillingSession
-from scripts.lib.zulip_tools import TIMESTAMP_FORMAT
-from zerver.lib.management import ZulipBaseCommand
-from zilencer.models import RemoteZulipServer
-
-
-class Command(ZulipBaseCommand):
-    help = "Assigns an existing RemoteZulipServer to the legacy plan"
-
-    @override
-    def add_arguments(self, parser: CommandParser) -> None:
-        parser.add_argument(
-            "server_id",
-            type=int,
-            help="ID of the RemoteZulipServer to be assigned to the legacy plan",
-        )
-        parser.add_argument(
-            "renewal_date",
-            type=str,
-            help="Billing cycle renewal date in the format YYYY-MM-DD-HH-MM-SS",
-        )
-        parser.add_argument(
-            "end_date",
-            type=str,
-            help="Billing cycle end date in the format YYYY-MM-DD-HH-MM-SS",
-        )
-
-    @override
-    def handle(self, *args: Any, **options: Any) -> None:
-        server_id = options["server_id"]
-        renewal_date_str = options.get("renewal_date")
-        if renewal_date_str is None:
-            renewal_date = timezone_now()
-        else:
-            renewal_date = datetime.strptime(renewal_date_str, TIMESTAMP_FORMAT).replace(
-                tzinfo=timezone.utc
-            )
-
-        end_date_str = options.get("end_date")
-        if end_date_str is None:
-            raise ValueError("end_date must be provided")
-
-        end_date = datetime.strptime(end_date_str, TIMESTAMP_FORMAT).replace(tzinfo=timezone.utc)
-
-        server = RemoteZulipServer.objects.get(id=server_id)
-        self.migrate_customer_to_legacy_plan(server, renewal_date, end_date)
-
-    def migrate_customer_to_legacy_plan(
-        self,
-        server: RemoteZulipServer,
-        renewal_date: datetime,
-        end_date: datetime,
-    ) -> None:
-        billing_schedule = RemoteServerBillingSession(server)
-        billing_schedule.migrate_customer_to_legacy_plan(renewal_date, end_date)