[FSSDK-11513] limit number of events in the eventStore #1206

Job	Run time
lint	1m 31s
unit_tests (18)	2m 2s
unit_tests (20)	1m 54s
unit_tests (22)	1m 53s
fullstack_production_suite / test	3s
integration_tests / test	7s
lint_markdown_files / lint	51s
Coveralls coverage	5s
	8m 26s

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