workos.webhooks.constructEvent does not support `flag.created` event, webhook events revoked

[leecjohnny]

SDK event de-serializer:

workos-node/src/common/serializers/event.serializer.ts

Line 26 in b6023aa

export const deserializeEvent = (event: EventResponse): Event => {

flag.created is not a case, which leads to the constructEvent to return undefined

In the undefined case, our web hook consumer will revoke the webhook event.

similar to previously resolved issue: #1360