[FSSDK-10843] remove crossbrowser and umd test from prepublish (#1067) #1261

Job	Run time
lint	1m 25s
fullstack_production_suite / test	4s
unit_tests (20)	1m 49s
unit_tests (18)	2m 5s
lint_markdown_files / lint	58s
unit_tests (24)	1m 48s
unit_tests (22)	1m 47s
integration_tests / test	5s
Coveralls coverage	3s
	10m 4s

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