Use vitest for some EW unit tests (#33816)

* Use vitest for some EW unit tests

* Ensure library builds are done before unit tests

* Stabilise jest tests

* Move more tests over

* Make sonar happier

* Update types/node for happy-dom compat again

* Decrease max-workers to stabilise jest tests

* Split jest over 3 runners to alleviate memory woes

* Switch jest to runInBand

* Attempt to deflake jest tests

* tweak coverage

* tweak coverage

package.json

@@ -23,7 +23,7 @@
         "docs:dev": "vitepress dev docs",
         "docs:build": "vitepress build docs",
         "docs:preview": "vitepress preview docs",
-        "test:unit": "vitest run",
+        "test:unit": "nx run-many -t test:unit:prepare -p && vitest run",
         "coverage:diff": "diff-cover --config-file diff-cover.toml apps/web/coverage/lcov.info packages/shared-components/coverage/lcov.info coverage/lcov.info"
     },
     "devDependencies": {