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Add option to exclude some tests from the default list #883

Job	Run time
Test Browser on macOS (safari, disabled)	1m 11s
Test Build	30s
Test Browser on macOS (safari, default)	1m 12s
Test Browser on Linux (firefox, disabled)	1m 13s
Test Browser on Linux (chrome, main)	33s
Test Browser on Linux (chrome, disabled)	54s
Test Browser on Linux (firefox, default)	1m 35s
Test Shell (jsc, main)	44s
Test Shell (spidermonkey, default)	4m 55s
Test Browser on macOS (safari, main)	53s
Test Shell (spidermonkey, main)	47s
Test Shell (v8, main)	40s
Test Shell (jsc, default)	2m 42s
Test Shell (spidermonkey, disabled)	1m 51s
Test Shell (v8, default)	2m 32s
Test Shell (jsc, disabled)	1m 24s
Test Shell (v8, disabled)	1m 24s
Test Browser on Linux (chrome, default)	1m 11s
Test Browser on Linux (firefox, main)	44s
	26m 55s