[saas-e2e] initial revision of SaaS E2E tests running in the dev-env (#24311)

* [saas-e2e] initial revision of SaaS E2E tests running in the dev-env

* [v1] make rubocop happy

* [v1] make rubocop happy

* [saas-e2e] more retries for webpack startup check

Co-authored-by: Alf Eaton <alf.eaton@overleaf.com>

* [web] restrict e2e_test_setup.mjs to running in the dev-env

Co-authored-by: Mathias Jakobsen <mathias.jakobsen@overleaf.com>

* [saas-e2e] import latest split-tests from production

---------

Co-authored-by: Alf Eaton <alf.eaton@overleaf.com>
Co-authored-by: Mathias Jakobsen <mathias.jakobsen@overleaf.com>
GitOrigin-RevId: 034343ee56b8d059090d8a5de74eaac24429b527

package.json

@@ -73,6 +73,7 @@
     "services/third-party-datastore",
     "services/third-party-references",
     "services/tpdsworker",
-    "services/web"
+    "services/web",
+    "tools/saas-e2e"
   ]
 }