Adjust request parameter name for new card method generation

[timur27]

Fixes #5111

Changes proposed in this Pull Request

This PR fixes the payment processing with the legacy card on the Blocks checkout page by adjusting the key of the request parameter, which is then taken in the payment processing WCPay gateway implementation.

Investigation results can be found here.

Testing instructions

Using the Blocks checkout page confirm that the following use cases are working as expected with UPE turned on:

1. Pay with a new legacy card (both with and without saving it)
2. Pay with a saved legacy card
3. Pay with any of the UPE methods
4. Turn off UPE and try steps 1-2 again

Why there are no tests added?

The following e2e tests cover Blocks checkout with a credit card. They failed before and will pass now.

There are also tests for payment processing in WC_Payment_Gateway_WCPay_Test, and requests are mocked to return the right parameter, which is why these tests were not failing.

---

Post merge

• Link to testing instructions from release testing doc following these instructions : Add link here / 'QA Testing Not Applicable'
• Add or update critical flows and testing instructions for critical flows, if applicable.
• Add what's changed (description, screenshot, demo videos etc.) to the release announcement post, if applicable.

[github-actions]

Size Change: +1 B (0%)

Total Size: 1.06 MB

Filename	Size	Change
release/woocommerce-payments/dist/blocks-checkout.js	22.2 kB	+1 B (0%)

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[mdmoore]

LGTM!