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Test times out often: "flutter widget-preview start doesn't crash on flutter clean" #184985

Description

@loic-sharma

The Windows tool_integration_tests_10_10 builder is flaky. Four of the last failures were caused by the flutter widget-preview start doesn't crash on flutter clean test, which was added by: #175058.

Example failures

  1. https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8684711647006949153/+/u/run_test.dart_for_tool_integration_tests_shard_and_subshard_10_10/stdout
  2. https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8684630592451802609/+/u/run_test.dart_for_tool_integration_tests_shard_and_subshard_10_10/stdout
  3. https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8684617883805701617/+/u/run_test.dart_for_tool_integration_tests_shard_and_subshard_10_10/stdout
  4. https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8684615441699905793/+/u/run_test.dart_for_tool_integration_tests_shard_and_subshard_10_10/stdout

Example logs

29:57 +25 ~3 -1: test/integration.shard/widget_preview_smoke_test.dart: flutter widget-preview start doesn't crash on flutter clean [E]
  TimeoutException after 0:15:00.000000: Test timed out after 15 minutes.
  dart:isolate  _RawReceivePort._handleMessage
  
Failed to delete C:\b\s\w\ir\x\t\flutter_widget_preview_smoke_test.78de0844: PathAccessException: Deletion failed, path = 'C:\b\s\w\ir\x\t\flutter_widget_preview_smoke_test.78de0844' (OS Error: The process cannot access the file because it is being used by another process, errno = 32)
...
30:37 +26 ~14 -1: Some tests failed.

Failing tests:
  test/integration.shard/widget_preview_smoke_test.dart: flutter widget-preview start doesn't crash on flutter clean

cc @bkonyi

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    c: contributor-productivityTeam-specific productivity, code health, technical debt.c: disabled testTracks the restoration of a disabled testc: flakeTests that sometimes, but not always, incorrectly passteam-toolOwned by Flutter Tool team

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