Adds loading state to ActionList items

[mperrotti]

Relates to https://github.com/github/primer/issues/2681

https://github.com/primer/react/assets/2313998/2d15f422-1e1f-428e-b6ac-99e30ef4328b

Changelog

New

• ActionList.item accepts loading prop

Changed

Removed

Rollout strategy

• [ ] Patch release
• [x] 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)
• [x] 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: 2c2f814498de6edeccabe7911d07f9ee6f2f9c15

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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[mperrotti]

This will be a draft until https://github.com/primer/react/pull/3913 is merged

[github-actions[bot]]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	91.25 KB (+0.16% 🔺)
packages/react/dist/browser.umd.js	91.51 KB (+0.19% 🔺)

[mperrotti]

@broccolinisoup - I think TreeView is actually the outlier. Here are the other components where we use a loading prop:

• Autocomplete.Menu
• Button/IconButton (PR)
• FilteredActionList
• InlineAutocomplete
• MarkdownViewer
• TextInput
• ToggleSwitch

[github-actions[bot]]

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[mperrotti]

Updating snapshots since we updated the stories.