fix: support Vite plugins adding a server entry

[brillout]

Add support for Vite plugins that add a server build entry. For example, this change is required for being able to use React Router with Telefunc.

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Latest commit: f3c0d274b01813145745ae645da810d95dbdc8d4

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[remix-cla-bot[bot]]

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[remix-cla-bot[bot]]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳

[brophdawg11]

Can you open an issue with a minimal reproduction that we can use to see the issue and validate the fix? Or, if it's possible to write a small E2E test with a vite plugin that demonstrates this issue that's even better - but if that's tricky or it needs to pull in a third party, let's just open an issue with a repro instead of pulling a third party into the E2E test.

[brillout]

Reproduction: https://github.com/brillout/telefunc-react-router/tree/repro

[brillout]

Bug report: https://github.com/remix-run/react-router/issues/14352

[brillout]

if it's possible to write a small E2E test

I ain't sure how to easily reproduce this without adding a Telefunc dependency to React Router's monorepo.

[rossipedia]

🥳 I would love to be able to supply entry files (and event root.tsx) as a vite plugin. We have several apps that use common entries and root routes, abstracting that away is a bit tedious as long as React Router requires root.tsx and the entry.*.tsx files to exist on disk at specific locations.