* [web] extract card comparison function
* [web] throw if more than 1 duplicate customer account
* [web] attempt to pick the pre-existing account
* [web] overwrite email of duplicate account
* Update services/web/scripts/helpers/migrate_recurly_customers_to_stripe.helpers.mjs
* [web] handle setting being undefined
* [web] allow other account to be reused if migrating account is using paypal
* [web] allow matching for customers with no payment method
GitOrigin-RevId: 7d8eeb4734a20c09ce3e0d73095e28696e212549