tests: Create a separate group for feature flag suites #515

Job	Run time
Tasks (latest) (3.6, ubuntu-20.04)	1m 24s
Tasks (pinned) (3.6, ubuntu-20.04)	3m 34s
Tasks (latest) (3.7, ubuntu-20.04)	2m 21s
Tasks (pinned) (3.7, ubuntu-20.04)	4m 4s
Tasks (latest) (3.8, ubuntu-20.04)	3m 53s
Tasks (pinned) (3.8, ubuntu-20.04)	4m 37s
Tasks (latest) (3.10, ubuntu-20.04)	2m 54s
Tasks (pinned) (3.9, ubuntu-20.04)	2m 6s
Tasks (latest) (3.11, ubuntu-20.04)	3m 19s
Tasks (pinned) (3.10, ubuntu-20.04)	4m 11s
Tasks (latest) (3.12, ubuntu-20.04)	5m 6s
Tasks (pinned) (3.11, ubuntu-20.04)	4m 54s
Tasks (latest) (3.13, ubuntu-20.04)	4m 49s
Tasks (pinned) (3.12, ubuntu-20.04)	3m 52s
All pinned Tasks tests passed	1s
	51m 5s

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