Add comprehensive array and dictionary tests for ConvertTo-Json by yotsuda · Pull Request #26742 · PowerShell/PowerShell

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

- Use IPAddress instead of integer for depth limit tests to clearly
  verify ToString() is called when depth is exceeded
- Use Unicode escape format for unicode key test
- Add array versions of DateTime, Guid, and enum serialization tests
- Remove duplicate 'array with hashtable elements' test

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

- Change IP from 10.0.0.1 to 192.168.1.1 for consistency with previous test
- Replace BeLike/Not-BeExactly with BeExactly using actual JSON output

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>