This PR adds fixtures for 2025-04-30.basil. I removed the forced version for some call if the client version is set.

The fixtures were reorganize a little to make it easier for next upgrades:

1. All webhook payload are under webhooks/.
2. The webhook event file name is the name of the webhook event (no suffix or extra description)
3. The content is always the full event (with evt_* id included)
4. HTTP call response fixutres are suffixed with _response but can have extra description in the name.

Payloads are copy pasted AS-IS from stripe and never edited.
If you need to update the payload for the purpose of your tests, for example setting the metadata.lago_payable_id (very typical), use the helper to modify the payload. Don't edit the files.

Next time we upgrade, we only have to copy the payload to a file.

let(:event_json) do
  get_stripe_fixtures("webhooks/setup_intent_succeeded.json") do |h|
    h[:data][:object][:customer] = "cus_666" if h[:data][:object][:customer].nil?
    h[:data][:object][:metadata] = metadata
  end
end
let(:stripe_customer) do
  create(:stripe_customer, payment_provider: stripe_provider, customer:, provider_customer_id: "cus_123")
end