Popover: Remove the caret

[TylerJDev]

Part of https://github.com/github/primer/issues/3432

Removes the caret in Popover.

Changelog

Removed

• Removes caret prop and associated styles from Popover component

Rollout strategy

• 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

• 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: 8f80d76

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	Major

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[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	97.12 KB (-0.36% 🔽)
packages/react/dist/browser.umd.js	97.46 KB (-0.23% 🔽)