observatory_port_test.dart leaks flutter_tester processes after completion #159154

flutter_tools % ps
  PID TTY           TIME CMD
58437 ttys003    0:00.08 /opt/homebrew/bin/zsh -il
60869 ttys007    0:00.02 /opt/homebrew/bin/zsh -il

flutter_tools % dart test test/integration.shard/observatory_port_test.dart
00:20 +3: All tests passed!

flutter_tools % ps
  PID TTY           TIME CMD
58437 ttys003    0:00.10 /opt/homebrew/bin/zsh -il
64196 ttys003    0:03.10 /Users/matanl/Developer/flutter/bin/cache/artifacts/engine/darwin-x64/flutter_tester --run-forever --non-interactive --enable-dart-profiling --packages=/private/var/folders/qw/qw_3qd1x4kz5w975jhdq4k58007b7h/T/flutter_run_test.owx8ls/.dart_tool/p
64201 ttys003    0:00.54 /Users/matanl/Developer/flutter/bin/cache/dart-sdk/bin/dart development-service --vm-service-uri=http://127.0.0.1:61299/aFm0Tn5ICCQ=/ --bind-address=127.0.0.1 --bind-port=61285
64202 ttys003    0:00.26 /Users/matanl/Developer/flutter/bin/cache/dart-sdk/bin/dart devtools --no-launch-browser
64290 ttys003    0:02.67 /Users/matanl/Developer/flutter/bin/cache/artifacts/engine/darwin-x64/flutter_tester --run-forever --non-interactive --enable-dart-profiling --packages=/private/var/folders/qw/qw_3qd1x4kz5w975jhdq4k58007b7h/T/flutter_run_test.wpQM2o/.dart_tool/p
64291 ttys003    0:00.50 /Users/matanl/Developer/flutter/bin/cache/dart-sdk/bin/dart development-service --vm-service-uri=http://127.0.0.1:61338/vobn9A6iE-M=/ --bind-address=127.0.0.1 --bind-port=61339
64292 ttys003    0:00.27 /Users/matanl/Developer/flutter/bin/cache/dart-sdk/bin/dart devtools --no-launch-browser
64389 ttys003    0:02.32 /Users/matanl/Developer/flutter/bin/cache/artifacts/engine/darwin-x64/flutter_tester --run-forever --non-interactive --enable-dart-profiling --packages=/private/var/folders/qw/qw_3qd1x4kz5w975jhdq4k58007b7h/T/flutter_run_test.mZZlyF/.dart_tool/p
64402 ttys003    0:00.47 /Users/matanl/Developer/flutter/bin/cache/dart-sdk/bin/dart development-service --vm-service-uri=http://127.0.0.1:61415/_4xzixEjRxY=/ --bind-address=127.0.0.1 --bind-port=61395