chore: fix test run when linking vite

[bluwy]

• Install sass in packages/vite-plugin-svelte so the vitePreprocess unit test is able to import sass
• Add inlineConfig in vitePreprocess unit test so it has a proper root to resolve sass
• Refactor dynamic import hack to normal import
  • I'm not really sure why, but ever since refactor!: remove jest condition vitejs/vite#14544 it causes Vitest to error with:

 FAIL  packages/e2e-tests/import-queries/__tests__/import-queries.spec.ts > ssrLoadModule
TypeError: A dynamic import callback was not specified.
 ❯ eval packages/vite-plugin-svelte/src/utils/load-svelte-config.js:22:30
     20| // see https://github.com/microsoft/TypeScript/issues/43329#issuecomment-811606238
     21| // also use timestamp query to avoid caching on reload
     22| const dynamicImportDefault = new Function(
       |                              ^
     23|  'path',
     24|  'timestamp',
 ❯ Module.loadSvelteConfig packages/vite-plugin-svelte/src/utils/load-svelte-config.js:39:26
 ❯ Module.preResolveOptions packages/vite-plugin-svelte/src/utils/options.js:146:9
 ❯ config packages/vite-plugin-svelte/src/index.js:57:21
 ❯ runConfigHook ../vite/packages/vite/src/node/packages.ts:17905:31
 ❯ resolveConfig ../vite/packages/vite/src/node/packages.ts:17353:20
 ❯ _createServer ../vite/packages/vite/src/node/packages.ts:16592:20
 ❯ packages/e2e-tests/import-queries/__tests__/import-queries.spec.ts:135:10

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Serialized Error: { code: 'ERR_VM_DYNAMIC_IMPORT_CALLBACK_MISSING' }
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But anyways it's good that we can remove the hack today as we don't use TS.