chore: update download apis to use path #2414

Job	Run time
test / test-dart-vm (3.0.1)	2m 32s
test / test-dart-vm (stable)	2m 48s
dart2js_test / test-dart-2js (3.0.1, chrome)	4m 38s
dart2js_test / test-dart-2js (3.0.1, firefox)	4m 51s
ddc_test / test-dart-ddc (3.0.1, chrome)	4m 19s
native_test / test-dart-native (macos-latest)	3m 55s
dart2js_test / test-dart-2js (stable, chrome)	4m 42s
ddc_test / test-dart-ddc (3.0.1, firefox)	4m 13s
native_test / test-dart-native (windows-latest)	4m 35s
dart2js_test / test-dart-2js (stable, firefox)	4m 32s
ddc_test / test-dart-ddc (stable, chrome)	3m 51s
ddc_test / test-dart-ddc (stable, firefox)	4m 6s
	49m 2s

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