Add improvement to tabbed page block configuration #524

Job	Run time
Library test (js)	59s
Server tests	4m 9s
Library test (vue)	1m 3s
Web client test (admin)	1m 36s
Web client test (compose)	1m 35s
Web client test (discovery)	1m 42s
Web client test (privacy)	1m 33s
Web client test (reporter)	1m 53s
Web client test (one)	1m 40s
Web client test (workflow)	1m 29s
Send matrix testing notification	0s
	17m 39s

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