fix(codeblock): apply magic comments after Prism

[staticpayload]

Summary

• render Prism using the raw code input before stripping magic comments
• derive magic-comment line classes from tokenized lines to keep line numbers stable
• add token-based parsing tests

Fixes #8550

Testing

• corepack yarn test packages/docusaurus-theme-common/src/utils/tests/codeBlockUtils.test.ts

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[staticpayload]

Netlify deploy preview was failing with a Rspack panic ("should be pending if module is not in the module graph"). I pushed 8c42123 to set deploy-preview env flags and in so previews avoid that crash. Netlify is rerunning.

[staticpayload]

Note: the deploy-preview env change is in website/netlify.toml under [context.deploy-preview.environment].

[netlify]

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