[FSSDK-11197] EventTags type fix for v5 #1164

Job	Run time
lint	1m 5s
unit_tests (16)	2m 8s
crossbrowser_and_umd_unit_tests	2m 19s
unit_tests (18)	1m 58s
unit_tests (20)	2m 0s
integration_tests / test	6s
lint_markdown_files / lint	57s
unit_tests (14)	2m 11s
fullstack_production_suite / test	6s
Coveralls coverage	6s
	12m 56s

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