Forms: Add variation picker for the horizonal form

[enejb]

This PR add a variation picker to the new layout support PR.

It lets users switch between the horizontal and regular forms. By selecting the horizontal variation.

Todo

• Update the icons and copy for the new variation.

Proposed changes:

• Add a new horizontal form variation.
• Add a new feature flag for the horizontal form.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

ask in zap

Does this pull request change what data or activity we track or use?

No

Testing instructions:

Load up this PR.
Add a new forms. Switch between the different variation in the sidebar.
Does it work as expected.
Use the layout controls does the variation switch happen as expected.

The Variation doesn't change the layout of the form. This part is controlled by all the other changes.

[github-actions]

Thank you for your PR!

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---

🔴 Action required: Please add missing changelog entries for the following projects: projects/packages/forms

Use the Jetpack CLI tool to generate changelog entries by running the following command: jetpack changelog add.
Guidelines: /docs/writing-a-good-changelog-entry.md

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Follow this PR Review Process:

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[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WoA dev site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin (Jetpack), and enable the add/forms-layout-support-add-vatiation branch.
• To test on Simple, run the following command on your sandbox:

bin/jetpack-downloader test jetpack add/forms-layout-support-add-vatiation

Interested in more tips and information?

• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
• Read more about our development workflow here: PCYsg-eg0-p2
• Figure out when your changes will be shipped to customers here: PCYsg-eg5-p2

[jp-launch-control]

Code Coverage Summary

No summary data is available for parent commit d697fcf, so cannot calculate coverage changes. 😴

If that commit is a feature branch rather than a trunk commit, this is expected. Otherwise, this should be updated once coverage for d697fcf is available.

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