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Github Workflow: split tests #678

Job	Run time
Test Browser (chrome)	1m 46s
Test Build	29s
Test Browser (safari)	2m 31s
Test Browser (firefox)	2m 3s
Test Shell (jsc, default)	3m 34s
Test Shell (spidermonkey, default)	5m 24s
Test Shell (jsc, main)	59s
Test Shell (jsc, disabled)	2m 5s
Test Shell (spidermonkey, disabled)	1m 56s
Test Shell (v8, main)	43s
Test Shell (v8, disabled)	1m 20s
Test Shell (v8, default)	2m 58s
Test Shell (spidermonkey, main)	47s
	26m 35s