Release focused launchpad to wpcalypso - with tests fix

[paulopmt1]

Context: p1738781315185299/1737519094.618889-slack-C04H4NY6STW
PT: pet6gk-1T7-p2

Proposed Changes

We want to allow designers to test the Focused Launchpad in My home on wpcalypso so they can test the whole flow with the proper redirects it does

Why are these changes being made?

Just adding the ?flags=home/launchpad-first doesn't allow us testing everything because /site-creating/processing removes it and the /home redirect also removes it redirecting the user back to /build/launchpad instead of keeping them at the focused launchpad.

Testing Instructions

• Just ensure we're editing the correct file to release the changes to wpcalypso, instead of staging or even prod.

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 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-132457

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-132457&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-132457&env=a8c-for-agencies

[matticbot]

This PR does not affect the size of JS and CSS bundles shipped to the user's browser.

Generated by performance advisor bot at iscalypsofastyet.com.

[matticbot]

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

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

• notifications
• wpcom-block-editor

To test WordPress.com changes, run install-plugin.sh $pluginSlug revert-99373-revert-99370-update/release-launchpad-first-on-wpcalypso on your sandbox.

[paulopmt1]

This was already approved here: #99370

[paulopmt1]

Pre-release tests passed here on TeamCity.