Add TrailingAction support to NavList

[khiga8]

Fixes: https://github.com/github/primer/issues/1966 Unblocks: https://github.com/github/accessibility-audits/issues/2942

Changelog

New

This PR adds TrailingAction support to NavList, extending the support we added to ActionList in https://github.com/primer/react/pull/4634.

Rollout strategy

• [x] Patch release
• [ ] Minor release
• [ ] Major release; if selected, include a written rollout or migration plan
• [ ] None; if selected, include a brief description as to why

Testing & Reviewing

Merge checklist

• [x] Added/updated tests
• [x] Added/updated documentation
• [x] Added/updated previews (Storybook)
• [ ] Changes are SSR compatible
• [x] Tested in Chrome
• [x] Tested in Firefox
• [x] 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[bot]]

🦋 Changeset detected

Latest commit: 27e01a81623dbee96fd4aa024af6ccdf5eeeda64

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

This PR includes changesets to release 1 package

Name	Type
@primer/react	Minor

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[github-actions[bot]]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	91.07 KB (+0.12% 🔺)
packages/react/dist/browser.umd.js	91.32 KB (+0.08% 🔺)

[khiga8]

The failing test is a snapshot test which seems to be failing unrelated to my changes.

[khiga8]

The test failure seems unrelated to my changes. It looks like changes in ID in the jest snapshot tests 🤔 . Any suggestions for moving forward here @primer/react-reviewers?