Icons: Add cart icon.

[jasmussen]

What?

This PR adds a "cart" icon:

Why?

It is a generically useful icon for a variety of e-commerce contexts.

Testing Instructions

npm run storybook:dev

[github-actions]

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Co-authored-by: jasmussen <joen@git.wordpress.org>
Co-authored-by: t-hamano <wildworks@git.wordpress.org>
Co-authored-by: juanfra <juanfra@git.wordpress.org>

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[github-actions]

Flaky tests detected in 3943b78.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/19629441022
📝 Reported issues:

• [Flaky Test] should show the original content after revert and page reload #68604 in /test/e2e/specs/site-editor/template-revert.spec.js

[t-hamano]

LGTM 👍

[juanfra]

Beautiful icon! ✨ LGTM

cart-icon.mp4

[jasmussen]

Thank you both!