## Is your feature request related to a problem?

We manage around 20 3rd party tools that our internal users can log into using G Suite (part of your enterprise / scale offering). When a user leaves, we need to disable their account. Currently we need to do this in G Suite and then any of the 3rd party tools where password login is still possible.

## Describe the solution you'd like

When a user leaves, we disable their account in G Suite and their account in PostHog becomes disabled too. Essentially, the ability to restrict specific users in PostHog to only be able to login via SSO (defaulting to this setting).

## Describe alternatives you've considered

Manually removing their account, and being the enemy of our IT manager.

## Additional context



#### *Thank you* for your feature request – we love each and every one!

ee/api/test/test_authentication.py
self.client.logout()
        
        with self.settings(**MOCK_SETTINGS):
            response = self.client.post("/api/login", {"email": self.CONFIG_EMAIL, "password": self.CONFIG_PASSWORD})
        self.assertEqual(response.status_code, status.HTTP_200_OK)
        self.assertEqual(response.json(), {"success": True})
        
        with self.settings(**MOCK_SETTINGS, SAML_ENFORCED=True):
            response = self.client.post("/api/login", {"email": self.CONFIG_EMAIL, "password": self.CONFIG_PASSWORD})
        self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
        self.assertEqual(
            response.json(),
            {
                "type": "validation_error",
                "code": "saml_enforced",
                "detail": "This instance only allows SAML login.",
                "attr": None,
            },
        )
        
        with self.settings(**MOCK_SETTINGS, SAML_ENFORCED=True):
            response = self.client.get("/login")
        self.assertEqual(response.status_code, status.HTTP_302_FOUND)
        self.assertEqual(response.headers["Location"], "/login/saml/?idp=posthog_custom")