chore(repo): Clean up workers #967

Job	Run time
test / Test (3.0.1)	2m 57s
test / Test (stable)	3m 3s
test / Test (beta)	3m 58s
native_test / Native Test (macos-latest)	4m 7s
native_test / Native Test (windows-latest)	3m 38s
ddc_test / Test (3.0.1, chrome)	3m 34s
ddc_test / Test (3.0.1, firefox)	3m 45s
ddc_test / Test (stable, chrome)	4m 43s
ddc_test / Test (stable, firefox)	4m 51s
ddc_test / Test (beta, chrome)	5m 15s
ddc_test / Test (beta, firefox)	5m 25s
dart2js_test / Test (3.0.1, chrome)	5m 1s
dart2js_test / Test (3.0.1, firefox)	4m 58s
dart2js_test / Test (stable, chrome)	4m 46s
dart2js_test / Test (stable, firefox)	5m 17s
dart2js_test / Test (beta, chrome)	4m 28s
dart2js_test / Test (beta, firefox)	4m 43s
	1h 14m 29s

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