feat: add clear selection button to multiselect

[massao]

Purpose of PR

Adds onClearSelection prop to multiselect that makes a clear selection button show if there are more than 1 element selected.

Added a new Story to storybook that uses the onClearSelection

[vercel[bot]]

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Name	Status	Preview	Updated (UTC)
forma-36	✅ Ready (Inspect)	Visit Preview	Jul 4, 2024 2:53pm

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: a77877bef34d124d909ec7a9d6e8a8f59fccb809

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

This PR includes changesets to release 1 package

| Name | Type | | --------------------------- | ----- | | @contentful/f36-multiselect | Minor |

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[github-actions[bot]]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
CommonJS	135.98 KB (0%)	2.8 s (0%)	119 ms (+78% 🔺)	2.9 s
Module	132.24 KB (0%)	2.7 s (0%)	122 ms (+70.6% 🔺)	2.8 s