[FSSDK-10843] remove crossbrowser and umd test from prepublish #1260

Job	Run time
lint	1m 23s
lint_markdown_files / lint	51s
unit_tests (22)	1m 55s
unit_tests (18)	2m 2s
unit_tests (24)	1m 39s
fullstack_production_suite / test	5s
unit_tests (20)	1m 58s
integration_tests / test	8s
Coveralls coverage	6s
	10m 7s

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