Woo Onboarding: Add email verification functionality

[sixhours]

Proposed Changes

• Clicking on the "Resend email verification" button should send a verification email.
• If the email has already been verified or if there's another failure, an error message should be displayed.
• The button text should change to provide user feedback.

Visuals

Screen.Recording.2022-06-09.at.10.00.15.AM.mov

Testing Instructions

• Switch to this PR, navigate to /setup/wooVerifyEmail?siteSlug=[your site slug]&flags=signup/woo-verify-email
• Test both with an account that has not yet been verified and one that has.
• If the email needs verification, the button should display "Sending..." then "Request sent!"
• If the email can't be verified, an error message should be shown.

Fixes #64163 #64461

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-35447

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-35447&env=jetpack

[matticbot]

Here is how your PR affects size of JS and CSS bundles shipped to the user's browser:

App Entrypoints (~218 bytes added 📈 [gzipped])

name           parsed_size           gzip_size
entry-stepper       +707 B  (+0.0%)     +218 B  (+0.0%)

Common code that is always downloaded and parsed every time the app is loaded, no matter which route is used.

Sections (~44 bytes added 📈 [gzipped])

name                      parsed_size           gzip_size
woocommerce-installation       +178 B  (+0.1%)      +44 B  (+0.0%)

Sections contain code specific for a given set of routes. Is downloaded and parsed only when a particular route is navigated to.

Legend

What is parsed and gzip size?

Parsed Size: Uncompressed size of the JS and CSS files. This much code needs to be parsed and stored in memory.
Gzip Size: Compressed size of the JS and CSS files. This much data needs to be downloaded over network.

Generated by performance advisor bot at iscalypsofastyet.com.

[sixhours]

We may want to break the sendVerification function out into a shared hook since we'll need it elsewhere in both Stepper and possibly Calypso.

[markbiek]

Worked as expected. LGTM!

[a8ci18n]

This Pull Request is now available for translation here: https://translate.wordpress.com/deliverables/7375732

Thank you @sixhours for including a screenshot in the description! This is really helpful for our translators.

[a8ci18n]

Translation for this Pull Request has now been finished.