fix: handle yarn command fail when root does not exist

[sapphi-red]

Description

Angular sets a path that doesn't exist to root.
https://github.com/angular/angular-cli/blob/ea4a125233c3ad9bc225e365b21a6b5d2d885720/packages/angular/build/src/builders/dev-server/vite-server.ts#L550-L553

That makes execSync to fail, because Windows requires cwd to exist.

vite/packages/vite/src/node/server/index.ts

Lines 1046 to 1049 in c1ed8a5

	const enableGlobalCache =
	execSync('yarn config get enableGlobalCache', { cwd: root })
	.toString()
	.trim() === 'true'

This PR fixes that by using searchForPackageRoot(root) for cwd instead of root. But I'm not sure if we want to support this case.

fixes #18136

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