Respect SIGINT (Ctrl-C) for Android scenario_app. (#50989)

Closes https://github.com/flutter/flutter/issues/144076.

I had to make some other cleanup changes in order to avoid the program
hanging.
1 file changed
tree: 03d60d4d673d69f025932dde7d3661fa7f32bb4a
  1. .github/
  2. assets/
  3. benchmarking/
  4. bin/
  5. build/
  6. ci/
  7. common/
  8. display_list/
  9. docs/
  10. examples/
  11. flow/
  12. flutter_frontend_server/
  13. flutter_vma/
  14. fml/
  15. impeller/
  16. lib/
  17. runtime/
  18. shell/
  19. skia/
  20. sky/
  21. testing/
  22. third_party/
  23. tools/
  24. vulkan/
  25. wasm/
  26. web_sdk/
  27. .ci.yaml
  28. .clang-format
  29. .clang-tidy
  30. .gitattributes
  31. .gitignore
  32. .pylintrc
  33. .style.yapf
  34. analysis_options.yaml
  35. AUTHORS
  36. BUILD.gn
  37. CODEOWNERS
  38. CONTRIBUTING.md
  39. DEPS
  40. Doxyfile
  41. LICENSE
  42. README.md
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