fix(sentry apps): Reuse taskworker alarm for webhooks

[Christinarlong]

part 1 of basically bringing back auto disable for webhooks heh

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
29379	1	29378	236

View the top 1 failed test(s) by shortest run time

tests.sentry.sentry_apps.api.endpoints.test_organization_sentry_app_installation_details.DeleteSentryAppInstallationDetailsTest::test_delete_install

Stack Traces | 6.98s run time

#x1B[1m#x1B[.../api/endpoints/test_organization_sentry_app_installation_details.py#x1B[0m:149: in test_delete_install
    response_body = json.loads(responses.calls[0].request.body)
#x1B[1m#x1B[31m.venv/lib/python3.13.../site-packages/responses/__init__.py#x1B[0m:242: in __getitem__
    return self._calls[idx]
#x1B[1m#x1B[31mE   IndexError: list index out of range#x1B[0m

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