perf(preloader): listen to qwikloader for early preloading

[wmertens]

• before: https://1acee95d.qwik-8nx.pages.dev/
• after: https://5bfd339d.qwik-8nx.pages.dev/
• moving preloader init into head: https://34cf102d.qwik-8nx.pages.dev/
• putting qwik loader in a separate bundle: https://1d2c4a6c.qwik-8nx.pages.dev/

[github-actions]

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Name	Status	Preview	Last Commit
qwik-docs	✅ Ready (View Log)	Visit Preview	e37f14e

[changeset-bot]

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Latest commit: e37f14e

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[pkg-pr-new]

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npm i https://pkg.pr.new/@builder.io/qwik@7610

npm i https://pkg.pr.new/@builder.io/qwik-city@7610

npm i https://pkg.pr.new/eslint-plugin-qwik@7610

npm i https://pkg.pr.new/create-qwik@7610

commit: e37f14e