Add proxy support #6929

Job	Run time
cancel-previous-workflow	3s
cancel-previous-workflow	3s
Dart 2.18 on ubuntu	7m 51s
Dart 2.18 on ubuntu	7m 51s
Dart 2.19 on ubuntu	8m 28s
Dart 2.19 on ubuntu	8m 28s
Dart 3.0 on ubuntu	8m 28s
Dart 3.0 on ubuntu	7m 54s
Dart 3.1 on ubuntu	7m 29s
Dart 3.1 on ubuntu	7m 29s
Dart 3.2 on ubuntu	10m 4s
Dart 3.2 on ubuntu	10m 4s
Dart 3.3 on ubuntu	9m 9s
Dart 3.3 on ubuntu	9m 9s
Dart 3.4 on ubuntu	9m 39s
Dart 3.4 on ubuntu	9m 39s
Dart stable on ubuntu	13m 25s
Dart stable on ubuntu	13m 25s
Dart beta on ubuntu	11m 42s
Dart beta on ubuntu	11m 42s
Dart stable on windows	10m 45s
Dart stable on windows	10m 45s
Dart stable on macos	11m 58s
Dart stable on macos	11m 58s
analyze / cancel-previous-workflow	5s
analyze / cancel-previous-workflow	5s
analyze / analyze	1m 1s
analyze / analyze	1m 1s
analyze / package-analysis	1m 45s
analyze / package-analysis	1m 45s
	3h 43m 10s

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