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

package.json

@@ -23,7 +23,8 @@
         "docs:dev": "vitepress dev docs",
         "docs:build": "vitepress build docs",
         "docs:preview": "vitepress preview docs",
-        "coverage:diff": "diff-cover --config-file diff-cover.toml apps/*/coverage/lcov.info packages/*/coverage/lcov.info"
+        "test:unit": "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": {
         "@action-validator/cli": "^0.6.0",
@@ -31,6 +32,7 @@
         "@nx-tools/nx-container": "^7.2.1",
         "@playwright/test": "catalog:",
         "@types/node": "22",
+        "@vitest/coverage-v8": "catalog:",
         "cronstrue": "^3.0.0",
         "eslint-plugin-matrix-org": "^3.0.0",
         "husky": "^9.0.0",
@@ -42,6 +44,7 @@
         "nx": "22.7.5",
         "prettier": "3.8.3",
         "typescript": "catalog:",
+        "vitest": "catalog:",
         "vitepress": "^1.6.4",
         "vitepress-plugin-mermaid": "^2.0.17",
         "yaml": "^2.3.3"