chore: Implement authentication fixes for TestDataManager and update user management tests

- Refactored TestDataManager to use authenticated context with Playwright's newContext method.
- Updated auth-fixtures to ensure proper authentication state is inherited for API requests.
- Created constants.ts to avoid circular imports and manage shared constants.
- Fixed critical bug in auth setup that caused E2E tests to fail due to improper imports.
- Re-enabled user management tests with updated selectors and added comments regarding current issues.
- Documented environment configuration issues causing cookie domain mismatches in skipped tests.
- Generated QA report detailing test results and recommendations for further action.

.vscode/settings.json

@@ -15,5 +15,12 @@
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   "files.exclude": {},
   "search.exclude": {},
-  "files.associations": {}
+  "files.associations": {},
+  "python-envs.pythonProjects": [
+    {
+      "path": "",
+      "envManager": "ms-python.python:system",
+      "packageManager": "ms-python.python:pip"
+    }
+  ]
 }