Support connecting debug mode DevTools app to DevTools server #16336

Job	Run time
flutter-prep / ubuntu-latest Flutter Prep	36s
flutter-prep / macos-latest Flutter Prep	51s
benchmark-size	3m 8s
benchmark-performance	11m 21s
Dart Code Metrics	3m 16s
devtools_extensions integration-test integration_dart2js	10m 18s
macos goldens test_dart2js	7m 49s
devtools_app integration-test integration_dart2js - flutter - shard 1/3	10m 48s
devtools_app integration-test integration_dart2js - flutter - shard 2/3	15m 21s
main	4m 56s
devtools_app integration-test integration_dart2js - flutter - shard 3/3	18m 29s
devtools_app integration-test integration_dart2js - flutter-web - shard 1/2	10m 48s
build_ddc	3m 4s
build_dart2js	3m 12s
devtools_app_shared test	2m 33s
Tool test	2m 26s
devtools_app integration-test integration_dart2js - flutter-web - shard 2/2	13m 25s
test_ddc	9m 26s
devtools_extensions test	3m 10s
devtools_app integration-test integration_dart2js - dart-cli - shard 1/1	15m 58s
test_dart2js	9m 31s
devtools_shared test	2m 36s
	2h 43m 2s

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