Release testing instructions for WC Payments 5.4.0

Fix TOS acceptance can prevent saving settings or accessing the account dashboard PR #5414

Currently, if the merchant leaves the Stripe KYC immediately (before entering their phone number and 2FA, selecting country), they are not able to get back to the payments connect page, save their settings and complete the onboarding by generating a new link using the Update WooCommerce Payments business details task. See screenshots and steps to reproduce here.

This PR is aimed at allowing our merchants to finish the Stripe KYC if they have left it immediately (before entering their phone number and 2FA, selecting country). This is done by treating those customers as new and navigating them to the connect page if they have left the onboarding immediately.

Testing steps

• Navigate to the payments connect page (WP Admin > Payments). Verify it can be opened and click Finish Setup.
• Right after Stripe KYC starts, write down / memorize the stripe account id (we'll need it to compare during the next steps). Leave the onboarding immediately by clicking "Back" in the browser (and refresh the page).
• You should get back to the payments connect page again. Click Finish Setup and verify that it's the same Stripe account.
• Now enter your phone, pass 2FA and select a country. Click continue and leave the onboarding.
• Verify you are able to open the payments overview page.
• Verify you can generate a login link by clicking Update near the Update WooCommerce Payments business details task. The Stripe Express dashboard should open.
• Verify you can save account settings in WP Admin > Payments > Settings (after setting up the customer bank statement).
• Update all the details in Stripe Express and verify that account can accept payments and support deposits (account status is complete).
• Check happy path without leaving the Stripe KYC: onboard one more Stripe account, but now don't leave the Stripe KYC, fill it out successfully, and check that the account status is complete.