Where params are union of types, merge the types instead of having numbered suffixes in type names

[ramya-stripe]

Changelog

• Change type of PaymentIntentConfirmParams.mandate_data from Stripe.Emptyable<PaymentIntentConfirmParams.MandateData1 | PaymentIntentConfirmParams.MandateData2> to Stripe.Emptyable<PaymentIntentConfirmParams.MandateData> where the new MandateData is a union of all the properties of MandateData1 and MandateData2
• Change type of PaymentMethodCreateParams.card from PaymentMethodCreateParams.Card1 | PaymentMethodCreateParams.Card2 to PaymentMethodCreateParams.Card where the new Card is a union of all the properties of Card1 and Card2
• Change type of SetupIntentConfirmParams.mandate_data from Stripe.Emptyable<SetupIntentConfirmParams.MandateData1 | SetupIntentConfirmParams.MandateData2> to Stripe.Emptyable<SetupIntentConfirmParams.MandateData> where the new MandateData is a union of all the properties of MandateData1 and MandateData2