Forms: use componentry instead of CSS in integrations modal

[simison]

Some minor optimizations to use componentry instead of CSS in some parts of the integrations modal.

Only visual change should be the button size.

Before

After

Proposed changes:

• Use HStack instead of CSS+div
• Remove un-used is-spinning CSS + animation
• Set margin-bottom to 0 in toggle component instead of using CSS
• Opt-in button CTA to slightly larger button sizes with __next40pxDefaultSize — @ilonagl smaller button looked a bit more balanced and I'm not sure which ones we use in Figma library, but the larger ones are sort of the future version in Gutenberg componentry. We can at this point use either smaller or bigger.

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Jetpack product discussion

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Testing instructions:

• Go to '..'

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Code Coverage Summary

This PR did not change code coverage!

That could be good or bad, depending on the situation. Everything covered before, and still is? Great! Nothing was covered before? Not so great. 🤷

Full summary · PHP report · JS report

[simison]

We'll need to improve mobile screen for this, but this PR doesn't make it worse either and is identical with Trunk: