Forms: update empty state to use component from wp-ui

[simison]

Resolves FORMS-674

Proposed changes

• Uses EmptyState recently added to wp-ui.
• Adds icons to each empty state

Other information

• Generate changelog entries for this PR (using AI).

Related product discussion/links

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

Testing instructions

• Try empty forms lists and empty responses lists

[simison]

Ideally updated before this PR everywhere to the same version via #47907

[github-actions]

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[github-actions]

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[jp-launch-control]

Code Coverage Summary

Coverage changed in 1 file.

File	Coverage	Δ%	Δ Uncovered
projects/packages/forms/src/dashboard/components/empty-responses/index.tsx	0/44 (0.00%)	0.00%	-2 💚

Full summary · PHP report · JS report

[simison]

Still needs more work:

• Form icon doesn't show up
• The PR messes up Forms canvas styles somehow

[enejb]

I also notice on mobile it looks like this.

But didn't dig in why.