fix(frontend): auth e2e tests (#10312)

This pull request introduces extensive updates to the frontend testing
infrastructure, focusing on Playwright-based testing for user
authentication flows. Key changes include the addition of a global setup
for creating test users, new utilities for managing test user pools, and
expanded test coverage for signup and authentication scenarios.

### Testing Infrastructure Enhancements:

* **Global Setup for Tests**:
- Added `globalSetup` in `playwright.config.ts` to create test users
before all tests run. This ensures consistent test data across test
suites. (`autogpt_platform/frontend/playwright.config.ts`,
[autogpt_platform/frontend/playwright.config.tsR16-R17](diffhunk://#diff-27484f7f20f2eb1aeb289730a440f3a126fa825a7b3fae1f9ed19e217c4f2e40R16-R17))
- Implemented `global-setup.ts` to handle test user creation and save
user pools to the file system. Includes fallback for reusing existing
user pools if available.
(`autogpt_platform/frontend/src/tests/global-setup.ts`,
[autogpt_platform/frontend/src/tests/global-setup.tsR1-R43](diffhunk://#diff-3a8141beba2a6117e0eb721c35b39acc168a8f913ee625ce056c6fab5ac3b192R1-R43))

* **Test User Management Utilities**:
- Added functions in `auth.ts` to create, save, load, and clean up test
users. Supports batch creation and file-based persistence for user
pools. (`autogpt_platform/frontend/src/tests/utils/auth.ts`,
[autogpt_platform/frontend/src/tests/utils/auth.tsR1-R190](diffhunk://#diff-198b5d07aa72d50c153a70ecdfdc4bacc408c2d638c90d858f40d0183549973bR1-R190))
- Enhanced `user-generator.ts` to generate individual or multiple test
users with customizable options.
(`autogpt_platform/frontend/src/tests/utils/user-generator.ts`,
[autogpt_platform/frontend/src/tests/utils/user-generator.tsR2-R41](diffhunk://#diff-a7cb4f403a4cf3605ed1046b0263412205e56e51b16052a9da1e8db9bf34b940R2-R41))

### Expanded Test Coverage:

* **Signup Flow Tests**:
- Added comprehensive tests for signup functionality, including
successful signup, form validation, custom credentials, and duplicate
email handling. (`autogpt_platform/frontend/src/tests/signup.spec.ts`,
[autogpt_platform/frontend/src/tests/signup.spec.tsR1-R113](diffhunk://#diff-d1baa54deff7f3b1eedefd6cec5619ae8edd872d361ef57b6c32998ed22d6661R1-R113))
- Developed `signup.ts` utility functions to automate signup processes
and validate form behavior.
(`autogpt_platform/frontend/src/tests/utils/signup.ts`,
[autogpt_platform/frontend/src/tests/utils/signup.tsR1-R184](diffhunk://#diff-cb05d73a6bd7a129759b0b3382825e90cde561a42fc85b6a25777f6bd2f84511R1-R184))

* **Authentication Utilities**:
- Introduced `SigninUtils` in `signin.ts` for login, logout, and
authentication cycle testing. Provides reusable methods for verifying
user states. (`autogpt_platform/frontend/src/tests/utils/signin.ts`,
[autogpt_platform/frontend/src/tests/utils/signin.tsR1-R94](diffhunk://#diff-7cfec955c159d69f51ba9fcca7d979be090acd6fe246b125551d60192d697d98R1-R94))

### Minor Updates:

* Added environment variable `BROWSER_TYPE` to CI workflow for
browser-specific Playwright tests.
(`.github/workflows/platform-frontend-ci.yml`,
[.github/workflows/platform-frontend-ci.ymlR215-R216](diffhunk://#diff-29396f5dccefac146b71bed295fdbb790b17fda6a5ce2e9f4f8abe80eb14a527R215-R216))

These changes collectively improve the robustness and maintainability of
the frontend testing framework, enabling more reliable and scalable
testing of user authentication features.

### Checklist 📋

- [x] I have clearly listed my changes in the PR description
- [x] I have made a test plan
- [x] I have tested my changes according to the test plan:
  - [x] Validated all authentication tests, and they are working

.github/workflows/platform-frontend-ci.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       cache-key: ${{ steps.cache-key.outputs.key }}
-    
+
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
@@ -115,7 +115,7 @@ jobs:
     needs: setup
     # Only run on dev branch pushes or PRs targeting dev
     if: github.ref == 'refs/heads/dev' || github.base_ref == 'dev'
-    
+
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
@@ -212,6 +212,8 @@ jobs:
 
       - name: Run Playwright tests
         run: pnpm test:no-build --project=${{ matrix.browser }}
+        env:
+          BROWSER_TYPE: ${{ matrix.browser }}
 
       - name: Print Final Docker Compose logs
         if: always()