feat: migrate tippy to floating ui in plugin slash

[Saul-Mirone]

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Summary

Migrate tippy in slash plugin to @flating-ui/dom

How did you test this change?

CI & Manually

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Name	Status	Preview	Comments	Updated (UTC)
milkdown-storybook	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 12, 2024 1:14pm

[nx-cloud[bot]]

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[cypress[bot]]

Passing run #882 ↗︎

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Details:

Merge e7ab616355e2974a38e8af6717b8abb5f482526f into 4e1469145b21bdeb57ad7886474d...
Project: Default Project	Commit: aac3ed18d3 ℹ️
Status: Passed	Duration: 02:20 💡
Started: Jun 12, 2024 1:17 PM	Ended: Jun 12, 2024 1:20 PM

Review all test suite changes for PR #1375 ↗︎

[cypress[bot]]

Passing run #883 ↗︎

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Details:

feat: migrate tippy to floating ui in plugin slash (#1375)
Project: Default Project	Commit: a7ce1a9a48
Status: Passed	Duration: 01:50 💡
Started: Jun 12, 2024 1:24 PM	Ended: Jun 12, 2024 1:26 PM

Review all test suite changes for PR #1375 ↗︎