remove server style when css import is removed

[hi-ogawa]

Tracking for this long time skipped test

vite-plugin-react/packages/plugin-rsc/e2e/basic.test.ts

Lines 849 to 855 in 2a49b23

	// TODO: need a way to add/remove links on server hmr. for now, it requires a manually reload.
	test.skip('adding/removing css server @js', async ({ page }) => {
	await page.goto(f.url())
	await waitForHydration(page)
	await using _ = await expectNoReload(page)
	await testAddRemoveCssServer(page, { js: true })
	})

We could start with full-reload. Then later, make it hmr.

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After #841, implementing this might become harder (like we might need to bring back rsc-browser js virtual again).

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We need to know where css is still alive based on module graph. On client, this is taken care via import.meta.hot.prune(() => removeStyle(..)). https://github.com/vitejs/vite/blob/84079a84ad94de4c1ef4f1bdb2ab448ff2c01196/packages/vite/src/node/plugins/css.ts#L597

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There's prune event but this gets only triggered when importer has import.meta.hot.
https://github.com/vitejs/vite/blob/84079a84ad94de4c1ef4f1bdb2ab448ff2c01196/packages/vite/src/node/plugins/importAnalysis.ts#L829-L840