[FSSDK-11395] add specific type for decision notification (#1025) #1122

Job	Run time
crossbrowser_and_umd_unit_tests	6h 0m 13s
lint	1m 16s
unit_tests (16)	2m 10s
unit_tests (18)	1m 53s
unit_tests (20)	1m 41s
unit_tests (22)	1m 40s
fullstack_production_suite / test	6s
lint_markdown_files / lint	51s
integration_tests / test	7s
Coveralls coverage	1s
	6h 9m 58s

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