Card - Add tag argument (HDS-4688)

[KristinLBradley]

📌 Summary

If merged, this PR adds a tag argument to the Card component with accompanying Showcase example and tests.

Showcase: https://hds-showcase-git-hds-4688-add-card-tag-arg-hashicorp.vercel.app/components/card#tag

See related PR for docs: #2805

🛠️ Detailed description

• Adds @tag argument to Card allowing choice of div (the default) or li tags.
• Adds example to Showcase comparing default div tag to using an li tag.
• Adds integration tests for @tag argument

🔗 External links

• PR for tag arg documentation: Card - docs for tag arg (HDS-4688) #2805
• Jira ticket: HDS-4688

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👀 Component checklist

• Percy was checked for any visual regression
• A changelog entry was added via Changesets if needed (see templates here)

💬 Please consider using conventional comments when reviewing this PR.

[vercel]

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Name	Status	Preview	Updated (UTC)
hds-showcase	✅ Ready (Inspect)	Visit Preview	Apr 2, 2025 4:59pm
hds-website	✅ Ready (Inspect)	Visit Preview	Apr 2, 2025 4:59pm

[MelSumner]

A couple of notes:

1. Make sure to add a note that if the consumer uses the li tag, they need to wrap it in a ul element.
2. We'll probably want to make sure to do that on the showcase as well, so a11y tests won't fail
3. Please make sure to run the linter and/or a11y tests locally, just to catch whether or not the ul is working as intended.
4. The a11y section of the docs may need to be updated to conditionally conformant since the consumer is responsible for wrapping the cards in a ul element.

[shleewhite]

Thanks for making these changes!