[Split PE] Local tokens not being synced with the payment methods in Stripe from the Block checkout

[a-danae]

Describe the bug

When the local tokens and the payment methods in Stripe are out of sync, they don't get synced by visiting the Block checkout.

Bit of context:
When retrieving the tokens for a user, we check them with the payment methods saved in Stripe. The payment methods in Stripe are our source of truth. Local payment methods will get created or deleted according to those. This is handled by WC_Stripe_Payment_Tokens::woocommerce_get_customer_upe_payment_tokens().

To Reproduce

Deleting local tokens:

1. Check out add/deferred-intent
2. Under the Stripe extension settings, enable UPE
3. As a shopper, go to My account > Payment methods > Add new
4. Select Cards as the payment method
5. Enter 4242424242424242 and save
6. Go to My Account > Payment methods and confirm a token exists for the selected card
7. On the Stripe dashboard, go to the page for this customer
8. Delete the payment method you just saved

9. As the shopper, add a product to the cart and go to the Block checkout page
10. Notice that the payment method continues to be displayed

Creating local tokens:

1. As a shopper, go to My Account > Payment methods
2. Notice the payment methods that are listed
3. On the Stripe dashboard, go to the page for this customer
4. Add a new card

5. As the shopper, add a product to the cart and go to the Block checkout page
6. Notice that the newly added payment method isn't listed in the local tokens

Expected behavior
When visiting the Block checkout page, local tokens must be synced to the payment methods that exist in Stripe.

[a-danae]

Fixed by #2897