test(design-system): exclude some folder and files from coverage [AR-46651] (#132)

[Jira](https://github.com/drivenets/design-system/pull/AR-46651-add-tests-for-components-with-zero-coverage)

- '**/stories/**' - some components with multiple stories have "stories"
folder
- '**/*.stories.{ts,tsx}' - exclude stories itself
- '**/.storybook/**'  - exlude global Storybook configuration
- '**/*.scss' - exclude css files (they appear when you run tests with
coverage via Vitest plugin in Cursor)

Author: iromanchuk-dn

packages/design-system/vite.config.ts

@@ -9,6 +9,9 @@ const dirname = typeof __dirname !== 'undefined' ? __dirname : path.dirname(file
 
 export default defineConfig({
 	test: {
+		coverage: {
+			exclude: ['**/stories/**', '**/*.stories.{ts,tsx}', '**/.storybook/**', '**/*.scss'],
+		},
 		projects: [
 			{
 				extends: true,