test: migrate tailwind + pug test from Vite repo

[sapphi-red]

Description

Migrated tailwind + pug test (vitejs/vite#6987) from Vite main repo.
I tested that this test fails if this part is removed.

vite-plugin-vue/packages/plugin-vue/src/handleHotUpdate.ts

Lines 142 to 147 in 1e8d16e

	} else if (mainModule && !affectedModules.has(mainModule)) {
	const styleImporters = [...mainModule.importers].filter((m) =>
	isCSSRequest(m.url),
	)
	styleImporters.forEach((m) => affectedModules.add(m))
	}

refs vitejs/vite#11175

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.