fix(router-generator): do not allow "_" as a routeFIleIgnorePrefix

[SeanCassiere]

Closes #2315

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@tanstack/history

pnpm add https://pkg.pr.new/@tanstack/history@2339

@tanstack/create-router

pnpm add https://pkg.pr.new/@tanstack/create-router@2339

@tanstack/react-cross-context

pnpm add https://pkg.pr.new/@tanstack/react-cross-context@2339

@tanstack/react-router

pnpm add https://pkg.pr.new/@tanstack/react-router@2339

@tanstack/router-arktype-adapter

pnpm add https://pkg.pr.new/@tanstack/router-arktype-adapter@2339

@tanstack/react-router-with-query

pnpm add https://pkg.pr.new/@tanstack/react-router-with-query@2339

@tanstack/router-cli

pnpm add https://pkg.pr.new/@tanstack/router-cli@2339

@tanstack/router-devtools

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@tanstack/router-plugin

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@tanstack/router-generator

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@tanstack/router-vite-plugin

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@tanstack/router-valibot-adapter

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@tanstack/start

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@tanstack/router-zod-adapter

pnpm add https://pkg.pr.new/@tanstack/router-zod-adapter@2339

@tanstack/virtual-file-routes

pnpm add https://pkg.pr.new/@tanstack/virtual-file-routes@2339

@tanstack/start-vite-plugin

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commit: 87ce002