feat: drop node16

[Kikobeats]

• enable node22 in ci
• drop node16 from ci
• drop @ungap/structured-clone
• drop blob polyfill
• drop Readable.fromWeb polyfill
• removed Headers#getAll() → use Headers#getSetCookie instead
• upgrade undici@5 → undici@6

Closes #546

[changeset-bot]

🦋 Changeset detected

Latest commit: 99753c3

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

This PR includes changesets to release 6 packages

Name	Type
@edge-runtime/node-utils	Major
@edge-runtime/primitives	Major
@edge-runtime/vm	Major
@edge-runtime/types	Patch
@edge-runtime/jest-environment	Patch
edge-runtime	Patch

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[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
edge-runtime	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 28, 2024 3:20pm

[socket-security]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/@types/node@18.19.65	None	+1	2.1 MB	types
npm/undici@6.21.0	environment, network	0	1.16 MB	matteo.collina

🚮 Removed packages: npm/blob-polyfill@7.0.20220408, npm/undici@5.23.0

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