fix svelte-vite detection for NPM workspaces

In monorepo, the framework name will be an absolute path.

A follow up for storybookjs#23458.

code/frameworks/svelte-vite/src/utils.ts

@@ -22,8 +22,10 @@ export async function handleSvelteKit(plugins: PluginOption[], options: Options)
     'vite-plugin-sveltekit-setup',
     'vite-plugin-sveltekit-compile',
   ]);
+  // The package name can be either "@storybook/sveltekit" or an absolute path in monorepo.
+  const packageRegex = /(^|\/node_modules\/)@storybook\/sveltekit$/;
 
-  if (hasSvelteKitPlugins && framework !== '@storybook/sveltekit') {
+  if (hasSvelteKitPlugins && packageRegex.test(framework)) {
     throw new Error(dedent`
       We've detected a SvelteKit project using the @storybook/svelte-vite framework, which is not supported in Storybook 7.0
       Please use the @storybook/sveltekit framework instead.