## Is your feature request related to a problem?
See [this](https://github.com/PostHog/posthog/pull/9139/files/2754c0fd6633c806def5c328d491421ae7de0c19#diff-7f0217a57a02b6ebd709f6aa7bf43760b2d5a53069aee2b7fea27fdad1caadf1) for more info.


## Describe the solution you'd like

> This is used by django-rest-hooks, the library we use to integrate with Zapier. Specifically, this fires our Zapier integration's Triggers. However, the only trigger that actually matters is the "action_performed" one, and that has been completely delegated to the plugin server for a while. We can remove this Python cruft then, along with django-rest-hooks, but first we need to make sure action_defined and annotation_created actually are unused, and roll out an update to https://github.com/PostHog/posthog-zapier that'd remove those two completely.


## Describe alternatives you've considered

Do nothing
ee/models/hook.py
import json
from typing import Optional
from django.db import models
from django.db.models.signals import post_delete, post_save
from django.dispatch.dispatcher import receiver
from rest_hooks.models import AbstractHook
from statshog.defaults.django import statsd
from ee.tasks.hooks import DeliverHook
from posthog.constants import AvailableFeature
from posthog.models.signals import mutable_receiver
from posthog.models.team import Team
from posthog.models.utils import generate_random_token
from posthog.redis import get_client
class Hook(AbstractHook):