Changing subscription payment method to ACDC results in an error (3949)

[Dinamiko]

When an active subscription from another payment method, e.g. Stripe, is switched to ACDC from the my-account section, an error will be displayed in the frontend.

Steps To Reproduce

• buy a subscription with a third-party payment method like Stripe
• ensure ACDC Vaulting is enabled
• in my-account > Payment methods section, click “Add payment method”
• add an ACDC card, like 2223000048400011
• navigate to the subscription in my-account > Subscriptions > Change payment
• change the payment method to the saved ACDC token
  • observe an error in the frontend that the payment method could not be changed
• in subscription admin, observe that the payment method was changed despite the error
• upon triggering a renewal, observe error PAYMENT_SOURCE_MISMATCH error

This PR ensures that previous transaction logic is not executed when is not a payment from the plugin.

[Narek13]

Thanks. Just a small suggestion which you can ignore