Consolidate vitest CI & coverage (#33808)

* Consolidate modules vitest coverage

* Use vite-common as base for modules vitest config

* Make knip happier

* Fix coverage paths

* Place modules unit tests alongside src

* Switch to defineProject for better type safety

* Consolidate vitest CI & coverage

Kills off vite-common

* Update comment

* Update lockfile

* Fix shared-components vitest config

* Soften eslint config for tests in modules

* Run eslint on modules/playwright dir too

* Make tsc happy

modules/widget-lifecycle/package.json

@@ -13,7 +13,6 @@
     "devDependencies": {
         "@element-hq/element-web-module-api": "workspace:*",
         "@types/node": "^22.10.7",
-        "@vitest/coverage-v8": "catalog:",
         "typescript": "catalog:",
         "vite": "catalog:",
         "vitest": "catalog:"