Entrepreneur Signup: Remember path to last step during trial acknowledgement.

[yansern]

Related to #

⚠️ This is currently a fork of this PR. #91113

Proposed Changes

• Store the path to come back to after email verification during trial acknowledgement step.
• The path is stored in Calypso preferences.

Why are these changes being made?

• So that users can come back to the trial acknowledgement step after clicking email verification link.

Testing Instructions

• Open incognito window (as this is only for unverified users).
• Open network panel.
• Go to /setup/entrepreneur?ref=entrepreneur-signup.
• Create an account (or login into an unverified account).
• When you arrive at the Trial Acknowledge step, look for POST preferences API call in the network panel.
• You should see the key entrepreneur-flow-path-step-<user_id> being stored.

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 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-109004

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-109004&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-109004&env=a8c-for-agencies

[matticbot]

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

Sections (~60 bytes added 📈 [gzipped])

name                     parsed_size           gzip_size
import-hosted-site-flow       +274 B  (+0.0%)     +121 B  (+0.0%)
import-flow                   +274 B  (+0.0%)     +121 B  (+0.0%)
entrepreneur-flow             -102 B  (-0.2%)      -61 B  (-0.7%)

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.

[yansern]

This is just the simplify the code here (and fix an existing bug where ?ref= is not inherited after redirection from signing-up.