Fix encoding issue in from site

[ouikhuan]

Related to #75522

Proposed Changes

• In this PR, we encoded the from site query string before sending it down to the generatePath function so it won't get confused later

Testing Instructions

• Create a JN site, connect to your WordPress.com with user approval.
• Navigate to http://calypso.localhost:3000/setup/import-focused/import?siteSlug=${site_slug}.
• Fill in the site address and go through the flow.
• If you link your JN site correctly it should allow you to click on the import everything continue button
• Open your inspector and make sure there's no error like Uncaught (in promise) BadRequestError: Site url is not valid. when you land on the content chooser screen.

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-ajp-p2)?

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:commit-c0002c7a8c9a89009babd13d192ed595b25b463e

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:commit-c0002c7a8c9a89009babd13d192ed595b25b463e&env=jetpack

[matticbot]

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

Sections (~15 bytes added 📈 [gzipped])

name             parsed_size           gzip_size
site-setup-flow        +30 B  (+0.0%)      +15 B  (+0.0%)
import-flow            +30 B  (+0.0%)      +15 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.

[zaerl]

LGTM!

[bogiii]

👍