Remove unused NetworkRequest.durationDisplay getter and test (#9992)

Removes durationDisplay from NetworkRequest and its corresponding unit test in network_model_test.dart. The getter was not used anywhere in DevTools production code (durations are formatted directly via durationText in DurationColumn and HttpRequestOverviewView), which was causing DCM's check-unused-code to fail with 'getter durationDisplay is used only in tests'.
2 files changed
tree: c5b6e10245af1b319799d99fa168b5d5726dcc8d
  1. .agents/
  2. .gemini/
  3. .github/
  4. .vscode/
  5. _markdown_images/
  6. docs/
  7. packages/
  8. third_party/
  9. tool/
  10. .gitattributes
  11. .gitignore
  12. AGENTS.md
  13. analysis_options.yaml
  14. AUTHORS
  15. BETA_TESTING.md
  16. CLAUDE.md
  17. CODE_OF_CONDUCT.md
  18. CODEOWNERS
  19. CONTRIBUTING.md
  20. DEBUGGING.md
  21. devtools_options.yaml
  22. DOCUMENTATION.md
  23. flutter-candidate.txt
  24. LICENSE
  25. pubspec.lock
  26. pubspec.yaml
  27. README.md
  28. STYLE.md
  29. TESTING.md
  30. TRIAGE.md
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