Fixup animations in dialog

[keithamus]

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What are you trying to accomplish?

When integrating #2492 which is the big change to <dialog> I noticed that #2496 regressed some of the animations (I had not initially spotted this as I use prefers-reduced-motion and I forgot to toggle it off during #2496 during development but I remembered when integrating into dotcom).

This PR reintroduces the animations. I've marked skip changeset as this should be rolled up into the #2496 changeset.

Integration

Risk Assessment

• Low risk the change is small, highly observable, and easily rolled back.
• Medium risk changes that are isolated, reduced in scope or could impact few users. The change will not impact library availability.
• High risk changes are those that could impact customers and SLOs, low or no test coverage, low observability, or slow to rollback.

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Accessibility

• Fixes axe scan violation - This change fixes an existing axe scan violation.
• No new axe scan violation - This change does not introduce any new axe scan violations.
• New axe violation - This change introduces a new axe scan violation. Please describe why the violation cannot be resolved below.

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Lookbook)
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge

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