Remove support for sx from ActionList component and sub-components

[llastflowers]

Closes #6757
Closes https://github.com/github/primer/issues/5908
Closes #6774

Current sx usage: 7

✅ sx usages are only in repos other than github-ui; those usages have been added to the tracking issue

⚠️ NavList component is dependent on this one. Need to wait for sx removal to be completed there before proceeding. Issue: #6768 PR: #6868

Changelog

Removed

Remove support for sx from the ActionList component, and any sub-components, associated stories, docs, and tests

Rollout strategy

• Major release; if selected, include a written rollout or migration plan

This component currently has 0 sx usage in dotcom, and therefore does not need the @primer/styled-react wrapper. this will be confirmed again before merging.

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

[changeset-bot]

🦋 Changeset detected

Latest commit: 75096c7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@primer/react	Major
@primer/styled-react	Major

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