Fix astro-entry error on build with multiple JSX frameworks

[bluwy]

Changes

Update the internal vite-plugin-jsx to ignore transforming for astro-entry: virtual files. These virtual files only contain re-exports to enable treeshaking used exports only (added in #6527), so they can be skipped as they don't contain JSX.

But also it's skipped to avoid this confusing (and harmless) error:

 building client 
10:19:41 PM [renderer] astro-entry:/Users/bjorn/Work/oss/astro/packages/astro/test/fixtures/static-build-frameworks/src/components/PCounter.jsx
Unable to resolve a renderer that handles this file! With more than one renderer enabled, you should include an import or use a pragma comment.
Add import React from 'react' or /* jsxImportSource: react */ to this file.

It happens in the static-build-frameworks fixture currently.

Testing

Existing tests should pass, but I also manually tested static-build-frameworks so there's no false errors on build.

Docs

n/a. bug fix.

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