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/vitest.setup.ts

@@ -0,0 +1,4 @@
+import { expect } from "vitest"
+import * as matchers from "@testing-library/jest-dom/matchers"
+
+expect.extend(matchers)