Stabilize editor UI tests under parallel load #120

Job	Run time
Restore + Build Supporting Suites	52s
Restore + Build Browser Suites	46s
Run Browser Suite (Studio)	2m 38s
Run Browser Suite (Shell)	4m 3s
Run Browser Suite (Reader)	8m 42s
Run Browser Suite (Editor)	21m 38s
Run Supporting Suites	1m 48s
Resolve Release Version	0s
Publish Release Build	-1s
Publish GitHub Release	-1s
Deploy GitHub Pages	0s
	40m 25s

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