management: Delete generate_invite_links command.

This command predates there being a normal UI for inviting users to
Zulip. It no longer has a role for which it's a better way to do
things. (Especially with upcoming API documentation for the endpoint).

Fixes part of #18898.

zerver/management/commands/generate_invite_links.py

@@ -1,63 +0,0 @@
-from argparse import ArgumentParser
-from typing import Any
-
-from django.core.management.base import CommandError
-
-from confirmation.models import Confirmation, create_confirmation_link
-from zerver.lib.email_validation import email_allowed_for_realm
-from zerver.lib.management import ZulipBaseCommand
-from zerver.models import DomainNotAllowedForRealmError, PreregistrationUser
-
-
-class Command(ZulipBaseCommand):
-    help = "Generate activation links for users and print them to stdout."
-
-    def add_arguments(self, parser: ArgumentParser) -> None:
-        parser.add_argument(
-            "--force",
-            action="store_true",
-            help="Override that the domain is restricted to external users.",
-        )
-        parser.add_argument(
-            "emails",
-            metavar="<email>",
-            nargs="*",
-            help="email of users to generate an activation link for",
-        )
-        self.add_realm_args(parser, required=True)
-
-    def handle(self, *args: Any, **options: Any) -> None:
-        duplicates = False
-        realm = self.get_realm(options)
-        assert realm is not None  # Should be ensured by parser
-
-        if not options["emails"]:
-            self.print_help("./manage.py", "generate_invite_links")
-            raise CommandError
-
-        for email in options["emails"]:
-            try:
-                self.get_user(email, realm)
-                print(email + ": There is already a user registered with that address.")
-                duplicates = True
-                continue
-            except CommandError:
-                pass
-
-        if duplicates:
-            return
-
-        for email in options["emails"]:
-            try:
-                email_allowed_for_realm(email, realm)
-            except DomainNotAllowedForRealmError:
-                if not options["force"]:
-                    raise CommandError(
-                        "You've asked to add an external user '{}' to a "
-                        "closed realm '{}'.\nAre you sure? To do this, "
-                        "pass --force.".format(email, realm.string_id)
-                    )
-
-            prereg_user = PreregistrationUser(email=email, realm=realm)
-            prereg_user.save()
-            print(email + ": " + create_confirmation_link(prereg_user, Confirmation.INVITATION))