[FSSDK-11395] add specific type for decision notification #1118

Job	Run time
lint	1m 11s
crossbrowser_and_umd_unit_tests	6h 0m 13s
unit_tests (16)	2m 8s
unit_tests (18)	1m 54s
unit_tests (20)	1m 44s
unit_tests (22)	1m 37s
fullstack_production_suite / test	4s
integration_tests / test	7s
lint_markdown_files / lint	53s
Coveralls coverage	3s
	6h 9m 54s

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