Newsletter sidebar: fix no space under toggle

[simison]

Keeping the componentry up to latest Gutenberg changes.

In pre/post publish panels p tags have 1em top/bottom margin so __nextHasNoMarginBottom for the toggle component works fine, but in Newsletter sidebar it didn't.

Note also slightly bigger toggle size, which will be the default in future Gutenberg.

Proposed changes:

Couple small fixes:

• Fix no space under toggle
• Opt-in into 40px default size for the toggle
• Add accessibility label

Before

After

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Testing instructions:

• Go to '..'

[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 WordPress.com Simple 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, and enable the fix/newsletter-panel-whitespace branch.

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[github-actions]

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[crisbusquets]

Thank you 🙏