chore: add \0 to virtual files id

[sapphi-red]

Description

If the resolvedId doesn't start with \0, that parent directory will be watched by rollup.
This PR changes the id and resolvedId for virtual files to avoid that.

fixes #10096

Additional context

---

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[sapphi-red]

This is to avoid breaking change for this usage.
https://vitejs.dev/guide/backend-integration.html#backend-integration:~:text=If%20you%20haven%27t%20disabled%20the%20module%20preload%20polyfill%2C%20you%20also%20need%20to%20import%20the%20polyfill%20in%20your%20entry

[patak-dev]

/ecosystem-ci run

[vite-ecosystem-ci]

📝 Ran ecosystem CI: Open

suite	result
astro	✅ success
histoire	❌ failure
iles	✅ success
ladle	✅ success
laravel	✅ success
marko	✅ success
nuxt-framework	❌ failure
rakkas	✅ success
sveltekit	✅ success
vite-plugin-ssr	✅ success
vite-plugin-react	✅ success
vite-plugin-react-swc	✅ success
vite-plugin-svelte	✅ success
vite-plugin-vue	✅ success
vite-setup-catalogue	❌ failure
vitepress	✅ success
vitest	✅ success
windicss	✅ success

[patak-dev]

@sapphi-red we may need to wait until the next minor for this one

[sapphi-red]

@patak-dev I think it's slightly safer to include this in 4.0. But I'm ok with delaying this until 4.1.
I guess the ecosystem-ci was failing because this PR's base commit was a bit old.

[patak-dev]

/ecosystem-ci run

[vite-ecosystem-ci]

📝 Ran ecosystem CI: Open

suite	result
astro	✅ success
histoire	✅ success
iles	✅ success
ladle	✅ success
laravel	✅ success
marko	✅ success
nuxt-framework	❌ failure
rakkas	✅ success
sveltekit	✅ success
vite-plugin-ssr	✅ success
vite-plugin-react	✅ success
vite-plugin-react-swc	✅ success
vite-plugin-svelte	✅ success
vite-plugin-vue	✅ success
vite-setup-catalogue	✅ success
vitepress	✅ success
vitest	✅ success
windicss	✅ success

[patak-dev]

You're right, it was just the base commit