[FSSDK-11395] add specific type for decision notification #1121

Job	Run time
lint	1m 12s
crossbrowser_and_umd_unit_tests	6h 0m 13s
unit_tests (16)	2m 2s
unit_tests (18)	1m 52s
unit_tests (20)	1m 42s
unit_tests (22)	1m 39s
integration_tests / test	5s
lint_markdown_files / lint	48s
fullstack_production_suite / test	4s
Coveralls coverage	3s
	6h 9m 40s

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