[AI-FSSDK] [FSSDK-12369] Add local holdouts support to JavaScript SDK #1572

Job	Run time
typescript_test	1m 34s
browser_tests (safari)	5m 4s
lint	52s
browser_tests (firefox)	11m 21s
unit_tests (20)	1m 32s
integration_tests / test	7s
unit_tests (18)	1m 38s
unit_tests (24)	1m 19s
lint_markdown_files / lint	1m 9s
unit_tests (22)	1m 26s
fullstack_production_suite / test	5s
browser_tests (chrome)	9m 30s
browser_tests (edge)	9m 9s
Coveralls coverage	5s
	44m 51s

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