Update subscription triggers to use test tokens

[vcheung-stripe]

Reviewers

r? @charliecruzan-stripe
cc @stripe/developer-products

Summary

stripe trigger subscription.payment_succeeded and stripe trigger subscription.payment_failed currently fail:

Setting up fixture for: payment_method
Running fixture for: payment_method
Trigger failed: Request failed, status=402, body={
  "error": {
    "message": "Sending credit card numbers directly to the Stripe API is generally unsafe. We suggest you use test tokens that map to the test card you are using, see https://stripe.com/docs/testing. To enable raw card data APIs in test mode, see https://support.stripe.com/questions/enabling-access-to-raw-card-data-apis.",
    "request_log_url": "https://dashboard.stripe.com/test/logs/req_QMYi1CK0ecpLRX?t=1694021882",
    "type": "invalid_request_error"
  }
}

We fix this by using test tokens instead of passing raw card data to the API: https://stripe.com/docs/testing