refactor: auto inject hmr preamble without transformIndexHtml

[hi-ogawa]

Description

This PR changes the approach of running preamble code for hmr. Instead of using inline script of transformIndexHtml, we can heuristically target react code by __REACT_DEVTOOLS_GLOBAL_HOOK__ and inject preamble virtual.

This will likely cause doubly running preamble for some ssr frameworks which already injects it manually without transformIndexHtml, but it seems actually fine. @vitejs/plugin-rsc have the following logic and CI here didn't break (EDIT: I updated packages/common/refresh-runtime.js so injectIntoGlobalHook happens only once)

FYI, the idea of injecting to React code is something @vitejs/plugin-rsc did to handle AsyncLocalStorage:

vite-plugin-react/packages/plugin-rsc/src/plugin.ts

Lines 1077 to 1078 in 73be2f0

	`globalThis.AsyncLocalStorage = __viteRscAsyncHooks.AsyncLocalStorage;` +
	code

TODO

• check ecosystem-ci (actually the react plugin override is only done for react-router, vike, waku.)
  • astro https://github.com/vitejs/vite-ecosystem-ci/actions/runs/18163217112
  • react-router https://github.com/vitejs/vite-ecosystem-ci/actions/runs/18163224701
  • rakkas https://github.com/vitejs/vite-ecosystem-ci/actions/runs/18163231974
  • vike (html snapshot mismatch) https://github.com/vitejs/vite-ecosystem-ci/actions/runs/18163236718
  • waku https://github.com/vitejs/vite-ecosystem-ci/actions/runs/18163255227
  • vitest https://github.com/vitejs/vite-ecosystem-ci/actions/runs/18163260541
• deal with reactRefreshHost
• docs update https://vite.dev/guide/backend-integration.html
• full bundle mode?

[hi-ogawa]

Closed in favor of #890