[FSSDK-12868] remove localHoldout feature toggle #1618

Job	Run time
commonjs_test	1m 41s
unit_tests (22)	1m 27s
browser_tests (edge)	6m 24s
lint	54s
browser_tests (firefox)	6m 36s
typescript_test	1m 38s
unit_tests (24)	1m 17s
browser_tests (chrome)	4m 39s
unit_tests (18)	1m 39s
unit_tests (20)	1m 28s
browser_tests (safari)	5m 0s
integration_tests / test	8s
lint_markdown_files / lint	57s
fullstack_production_suite / test	7s
Coveralls coverage	4s
	33m 59s

Provide feedback