MSD: land to mailbox registration flow from domain overview card when no emails

[fushar]

Resolves #107032 (comment)

Proposed Changes

Fixes this card in domain overview when that domain has no emails yet:

BEFORE

Click on that card.

Land on Emails page with empty list and broken filter:

Click on the Add mailbox button at the top right.

Land in email registration flow:

Choose EXACTLY THE SAME DOMAIN as you started with.

... finally you can add mailbox:

AFTER

You land directly on the last screen.

OUT OF SCOPE

The <- Emails back button still points to /v2/emails 🥹 seems we need a better solution for handling this scenario. I'm marking this as out of scope of this PR, unless anyone feels strongly. I don't know a good solution for this.

Why are these changes being made?

The existing flow is confusing.

Testing Instructions

Test the scenario as described above.

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• Have you written new tests for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you tested accessibility for your changes? Ensure the feature remains usable with various user agents (e.g., browsers), interfaces (e.g., keyboard navigation), and assistive technologies (e.g., screen readers) (PCYsg-S3g-p2).
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the "[Status] String Freeze" label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
  • For UI changes, have we tested the change in various languages (for example, ES, PT, FR, or DE)? The length of text and words vary significantly between languages.
• For changes affecting Jetpack: Have we added the "[Status] Needs Privacy Updates" label if this pull request changes what data or activity we track or use (p4TIVU-aUh-p2)?

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-162047

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-162047&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-162047&env=a8c-for-agencies

[matticbot]

This PR modifies the release build for the following Calypso Apps:

For info about this notification, see here: PCYsg-OT6-p2

• help-center

To test WordPress.com changes, run install-plugin.sh $pluginSlug domain-no-emails-upsell on your sandbox.

[m1r0]

Makes sense, thanks for fixing it! It works as described.