ButtonGroup: Fix button and icon button styling when tooltips are used on them

[broccolinisoup]

Closes#4129

Changelog

New

Changed

• With this PR, we are wrapping button group items with a div. The main reason is to simplify CSS selection. You can view the previous attempt to write a CSS to fix styling issues both for tooltip v1 and v2 on button group.
• Enhanced CSS selection for the ButtonGroup children elements to ensure buttons and links still look the same if there are tooltips on them

Removed

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]

⚠️ No Changeset found

Latest commit: ea8b026

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[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	91.23 KB (-0.03% 🔽)
packages/react/dist/browser.umd.js	91.48 KB (-0.03% 🔽)

[primer-integration]

👋 Hi from github/github! Your integration PR is ready: https://github.com/github/github/pull/331337

[broccolinisoup]

closing in favour of #4723