[FSSDK-12242] support UNSTABLE_conditionEvaluators option #1528

Job	Run time
typescript_test	1m 30s
lint	52s
browser_tests (chrome)	7m 5s
browser_tests (safari)	3m 8s
browser_tests (edge)	11m 24s
browser_tests (firefox)	8m 38s
integration_tests / test	9s
unit_tests (24)	1m 25s
unit_tests (22)	1m 34s
fullstack_production_suite / test	6s
lint_markdown_files / lint	1m 7s
unit_tests (18)	1m 42s
unit_tests (20)	1m 30s
Coveralls coverage	3s
	40m 13s

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