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Github Workflow: split tests #716

Job	Run time
Test Build	32s
Test Browser (chrome, disabled)	1m 18s
Test Browser (chrome, default)	1m 34s
Test Browser (firefox, default)	1m 47s
Test Browser (firefox, main)	38s
Test Browser (safari, disabled)	1m 32s
Test Browser (safari, default)	2m 0s
Test Browser (firefox, disabled)	1m 52s
Test Shell (spidermonkey, main)	51s
Test Shell (v8, default)	2m 51s
Test Browser (chrome, main)	36s
Test Shell (jsc, default)	3m 25s
Test Browser (safari, main)	56s
Test Shell (jsc, main)	52s
Test Shell (spidermonkey, disabled)	2m 19s
Test Shell (spidermonkey, default)	5m 19s
Test Shell (v8, disabled)	1m 35s
Test Shell (jsc, disabled)	2m 1s
Test Shell (v8, main)	41s
	32m 39s