## 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
posthog/settings/web.py
"posthog.auth.PersonalAPIKeyAuthentication",
        "rest_framework.authentication.BasicAuthentication",
        "rest_framework.authentication.SessionAuthentication",
    ],
    "DEFAULT_PAGINATION_CLASS": "rest_framework.pagination.LimitOffsetPagination",
    "DEFAULT_PERMISSION_CLASSES": ["rest_framework.permissions.IsAuthenticated"],
    "DEFAULT_RENDERER_CLASSES": ["rest_framework.renderers.JSONRenderer"],
    "PAGE_SIZE": 100,
    "EXCEPTION_HANDLER": "exceptions_hog.exception_handler",
    "TEST_REQUEST_DEFAULT_FORMAT": "json",
    "DEFAULT_SCHEMA_CLASS": "drf_spectacular.openapi.AutoSchema",
    "STRICT_JSON": False,
}
if DEBUG:
    REST_FRAMEWORK["DEFAULT_RENDERER_CLASSES"].append("rest_framework.renderers.BrowsableAPIRenderer")  
RATE_LIMIT_ENABLED = get_from_env("RATE_LIMIT_ENABLED", False, type_cast=str_to_bool)
if RATE_LIMIT_ENABLED or TEST:
    
    
    REST_FRAMEWORK["DEFAULT_THROTTLE_CLASSES"] = [
        "posthog.rate_limit.PassThroughBurstRateThrottle",
        "posthog.rate_limit.PassThroughSustainedRateThrottle",
    ]
SPECTACULAR_SETTINGS = {
    "AUTHENTICATION_WHITELIST": ["posthog.auth.PersonalAPIKeyAuthentication"],
    "PREPROCESSING_HOOKS": ["posthog.api.documentation.preprocess_exclude_path_format"],
    "POSTPROCESSING_HOOKS": ["posthog.api.documentation.custom_postprocessing_hook"],
}
EXCEPTIONS_HOG = {"EXCEPTION_REPORTING": "posthog.exceptions.exception_reporting"}
def add_recorder_js_headers(headers, path, url):