#5861259 Display email forward details in new email pages

Changes proposed in this Pull Request

• This PR adds in additional details for email forwards as per the most recent design iteration in pcDL0W-al-p2

Testing instructions

• Navigate to a local dev branch or the Calypso live branch.
• Identify a site where you have a domain with email forwards configured.
• Add email/:siteSlug?flags=email/centralized-home to the URL.
• You should see the new email home page listing the domains for your site.
• Click on the row for your domain with forwards configured.
• Verify that we now display the target email address on a separate line for each forward,
• Ensure that you have at least one unverified receiving address.
  • To do this, click on “Add a new mailbox” to create a new email forward with a previously unused destination address that you can access.
  • After creating the forward, verify that you get a confirmation email to this address, but don’t take any action on the email.
• For this email forward that hasn’t been fully verified, confirm that you see all of the following:
  • A “Verification required” warning
  • A red highlight to the left of the card
  • A “Resend verification email” button is visible on the right of the row
• Click on the “Resend verification email” button, and verify that the resend succeeds, both via feedback in the UI and by confirming that you get the email, Also confirm that we log a Tracks event for the click.

Screenshot