CI: check multiple php versions for more compatibility #1264

Job	Run time
Detecting E2E Test Categories	40s
Test (general)	33m 11s
Test (advanced-label-1)	11m 31s
Test (advanced-label-2)	10m 58s
Test (advanced-label-3)	8m 38s
Test (advanced-label-4)	3m 23s
Test (advanced-label-5)	12m 46s
Test (blocks)	5m 51s
Test (blocks-home-link)	3m 23s
Test (blocks-navigation-link)	3m 57s
Test (blocks-navigation-submenu)	3m 6s
Test (bootstrap)	3m 3s
Test (build)	4m 25s
Test (compatibility)	2m 2s
Test (inner-blocks)	21m 15s
Test (inner-blocks-compatibility)	5m 30s
Test (panels)	4m 6s
Test (panels.build)	3m 48s
Test (plugins)	3m 30s
Test (woocommerce)	3m 25s
	2h 28m 28s

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