refactor: cleanup preloader

[maiieul]

What is it?

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

Description

Removing old SW deprecated APIs as well as unnecessary preloader ones. Cleaning up old logic to reduce code size and make it easier to inline the preloader logic in a future refactor.

Checklist

• 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

[changeset-bot]

🦋 Changeset detected

Latest commit: 767bfc1

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

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

built with Refined Cloudflare Pages Action

⚡ Cloudflare Pages Deployment

Name	Status	Preview	Last Commit
qwik-docs	✅ Ready (View Log)	Visit Preview	767bfc1

[pkg-pr-new]

Open in StackBlitz

@qwik.dev/core

npm i https://pkg.pr.new/QwikDev/qwik/@qwik.dev/core@8518

@qwik.dev/router

npm i https://pkg.pr.new/QwikDev/qwik/@qwik.dev/router@8518

eslint-plugin-qwik

npm i https://pkg.pr.new/QwikDev/qwik/eslint-plugin-qwik@8518

create-qwik

npm i https://pkg.pr.new/QwikDev/qwik/create-qwik@8518

@qwik.dev/optimizer

npm i https://pkg.pr.new/QwikDev/qwik/@qwik.dev/optimizer@8518

commit: 767bfc1

[Varixo]

LGTM

[wmertens]