rename experimentsIds to experimentIds in projectConfig event type (#… #1111

Job	Run time
crossbrowser_and_umd_unit_tests	6h 0m 14s
lint	1m 18s
unit_tests (16)	2m 16s
unit_tests (18)	1m 56s
unit_tests (20)	1m 48s
unit_tests (22)	1m 44s
fullstack_production_suite / test	3s
integration_tests / test	4s
lint_markdown_files / lint	52s
Coveralls coverage	3s
	6h 10m 18s

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