feat: Rename "Prefetch SW" to "Preloader"

[JerryWu1234]

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• Feature / enhancement
• Bug
• Docs / tests / types / typos
• Infra

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• My code follows the developer guidelines of this project
• I performed a self-review of my own code
• I added a changeset with pnpm change
• I made corresponding changes to the Qwik docs
• I added new tests to cover the fix / functionality

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Latest commit: 1d09a1e

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