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/src/components/Heading/H2/index.tsx

@@ -2,8 +2,10 @@
 
 import clsx from "clsx"
 import React from "react"
-import { CopyButton, Link } from "@/components"
-import { useHeadingUrl, useLayout } from "../../.."
+import { CopyButton } from "@/components/CopyButton"
+import { Link } from "@/components/Link"
+import { useHeadingUrl } from "../../../hooks/use-heading-url"
+import { useLayout } from "../../../providers/Layout"
 
 export type H2Props = React.HTMLAttributes<HTMLHeadingElement> & {
   id?: string