⚡️(CI) only e2e chrome mandatory

To speed up pull request flow, put e2e tests
only mandatory for Chrome.
We still have tests for Firefox and Webkit,
but they are not mandatory.
They will still have to be checked regularly,
particularly during the deployment phase.

src/frontend/apps/e2e/package.json

@@ -4,9 +4,12 @@
   "private": true,
   "scripts": {
     "lint": "eslint . --ext .ts",
-    "install": "playwright install --with-deps",
+    "install-playwright": "playwright install --with-deps",
     "test": "playwright test",
-    "test:ui": "yarn test --ui"
+    "test:ui": "yarn test --ui",
+    "test:ui::firefox": "yarn test:ui --project=firefox",
+    "test:ui::webkit": "yarn test:ui --project=webkit",
+    "test:ui::chromium": "yarn test:ui --project=chromium"
   },
   "devDependencies": {
     "@playwright/test": "1.45.3",