chore(repo): Clean up workers #1562

Job	Run time
test / Test (3.0.1)	4m 55s
test / Test (stable)	4m 34s
test / Test (beta)	6m 56s
ddc_test / Test (3.0.1, chrome)	5m 20s
ddc_test / Test (3.0.1, firefox)	6m 35s
ddc_test / Test (stable, chrome)	5m 7s
ddc_test / Test (stable, firefox)	5m 5s
ddc_test / Test (beta, chrome)	4m 45s
ddc_test / Test (beta, firefox)	6m 24s
dart2js_test / Test (3.0.1, chrome)	9m 54s
dart2js_test / Test (3.0.1, firefox)	8m 46s
dart2js_test / Test (stable, chrome)	8m 8s
dart2js_test / Test (stable, firefox)	7m 43s
dart2js_test / Test (beta, chrome)	7m 59s
dart2js_test / Test (beta, firefox)	7m 25s
native_test / Native Test (macos-latest)	7m 15s
native_test / Native Test (windows-latest)	6m 15s
	1h 53m 6s

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