fix css hot reload in route/layout files

[madaxen86]

PR Checklist

Please check if your PR fulfills the following requirements:

• Addresses an existing open issue: fixes #19818 (Tailwindlabs)
  also see discord support

What is the current behavior?

When adding or changing a tailwind class within a route/layout file, it does not get applied. Hot reloading of css is broken.
It works any tsx/jsx file which is not a route though.

This PR hook into the hot reload of the route/layout files and invalidates the cssModules.

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