Activation: Log in to WordPress.com account

[becdetat]

Acceptance criteria:

• Auto populate the email input of the first step with the store email. The CTA should redirect to the WordPress.com connection flow.
• The user is redirected back to the stepper after creating/connecting the WordPress.com account
• Event tracking:
  • wcadmin_wcpay_setup_stepper_setup_later - when the user clicks "set up later"
    • Event prop: step : step name - identify the step where the user clicked "set up later"
  • wcadmin_wcpay_setup_stepper_create_account - when the user clicks "create account"
  • wcadmin_wcpay_setup_stepper_connect_account - when the user clicks "connect your account"
• As a starting point, the only flow that redirects users to this screen is going to be the new welcome screen: WC Payments setup: WCPayments screen empty state changes #1436
  Redirect the user back to the new welcome screen (WC Payments setup: WCPayments screen empty state changes #1436) when they click "set up later"

Check the parent issue for any updates that might have been missed in this issue.

[ilyasfoo]

Estimate: 2

We could probably reuse/copy <Connect> component usage from the stepper here. For terms of service, I think we can use wcpay's <TosLink> component from client/tos/modal/index.js.