pool: implemented Role Stringer interface #3870

Job	Run time
run-tests-ce (1.20, 1.10, false, false)	4m 48s
testing_mac_os (1.20, macos-12, brew)	5m 3s
run-tests-ce (1.20, 2.8, false, false)	4m 44s
testing_mac_os (1.20, macos-12, 1.10.15)	4m 41s
run-tests-ce (1.20, 2.10, false, false)	4m 47s
testing_mac_os (1.20, macos-14, brew)	3m 53s
run-tests-ce (1.20, master, false, false)	12m 5s
testing_mac_os (stable, macos-12, brew)	5m 37s
run-tests-ce (stable, 1.10, false, false)	6m 48s
testing_mac_os (stable, macos-12, 1.10.15)	5m 19s
testing_mac_os (stable, macos-14, brew)	4m 0s
run-tests-ce (stable, 2.8, false, false)	6m 47s
run-tests-ce (stable, 2.10, false, false)	4m 47s
run-tests-ce (stable, master, false, false)	14m 3s
run-tests-ce (master, true, 1.20)	13m 22s
run-tests-ce (master, true, 1.20, false)	12m 0s
	1h 52m 44s

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