SSO e2e testing (#12739)

* Extend SSO auth workflows

* SSO e2e testing workflow

* Remove orphaned code

* Add unit tests for SSO

* improved error messaging

* Add test for SSO registration disabled

* Fix gating on LOGIN_ENABLE_SSO

* Adjust UI state management

* Add playwright test for SSO disabled

* Add backend unit tests

* Adjust API version

* Additional playwright tests

* Retain desired page state on login failure

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* Adjust test code

* Stricter matcher checking

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Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

src/frontend/package.json

@@ -129,6 +129,7 @@
         "@vitejs/plugin-react": "^5",
         "babel-plugin-macros": "^3.1.0",
         "nyc": "^18.0.0",
+        "oauth2-mock-server": "^9.1.0",
         "otpauth": "^9.5.1",
         "path": "^0.12.7",
         "rollup": "^4.61.1",