docs: added support for tests in www workspace (#14415)

* tests for components (WIP)

* finished adding tests to components

* added tests for providers

* add test command to doc tests

* fix imports

* exclude test files

* remove import

* add vitest as dev dependency

* fix build error

* ignore test files from eslint

* fix test from docs-ui

www/packages/docs-ui/tsconfig.json

@@ -15,5 +15,6 @@
     "declaration": true,
     "declarationMap": true
   },
-  "include": ["src/**/*", "tailwind.config.js", "postcss.config.js"]
+  "include": ["src/**/*", "tailwind.config.js", "postcss.config.js"],
+  "exclude": ["**/__tests__/**", "**/__mocks__/**"]
 }