Move all flows to non reskinned ui

[ddc22]

Related to

• Signup: Deprecate the concept of reskinned flows. #95419
• WPCC: Migrate wordpress connect flow to modern signup #98513

Proposed Changes

• Moves all signup flows to isReskinned
• Opts out video press from all styling related to the reskinned flow.

Why are these changes being made?

• The isReskinned flag has created unnecessary dependencies and complexity across the codebase, making it difficult to maintain and clean up. Migrating all signup flows to the reSkinned flavor will simplify the code, eliminate dead code, and reduce the risk of breakage in active flows when doing the final cleanup. Additionally, opting out Videopress from styling ensures its unique dark theme remains unaffected while benefiting from the updated UI structure.
• Read More: pdvytD-V6-p2

Testing Instructions

Check the UIs on the screens below work well

• Go to /start/crowdsignal, should have modern UI
• Create a new site and go to :
  /start/launch-only/launch?siteSlug=launchonlytest1.wordpress.com
• Go to /start/onboarding-registrationless
• Go to /start/rewind-setup
• Go to /start/__disabled_onboarding/initial-intent

And make sure look and feel is of the modern white signup UI

• Go to /start/videopress-account and make sure everything remains unchanged.

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-130366

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-130366&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-130366&env=a8c-for-agencies

[matticbot]

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

Sections (~103 bytes removed 📉 [gzipped])

name    parsed_size           gzip_size
signup       -580 B  (-0.2%)     -103 B  (-0.2%)

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.

[ddc22]

Keep videopress class since that has a completely different theme.

[oswian]

Tests well, nice cleanup!