feat(router, metro-runtime): reduce production web code

[EvanBacon]

Why

• Using the new source map support, I was able to identify and remove some development-only code feat(metro, cli, router): production static web source maps support #24213 -- over ~100kb smaller.

How

Test Plan

Checklist

• Documentation is up to date to reflect these changes (eg: https://docs.expo.dev and README.md).
• Conforms with the Documentation Writing Style Guide
• This diff will work correctly for npx expo prebuild & EAS Build (eg: updated a module plugin).

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