pool: implemented Role Stringer interface #3864

Job	Run time
run-tests-ce (1.20, 1.10, false, false)	4m 39s
run-tests-ce (1.20, 2.8, false, false)	4m 21s
run-tests-ce (1.20, 2.10, false, false)	4m 43s
run-tests-ce (1.20, master, false, false)	4m 24s
run-tests-ce (stable, 1.10, false, false)	4m 18s
testing_mac_os (1.20, macos-12, brew)	5m 28s
run-tests-ce (stable, 2.8, false, false)	4m 19s
run-tests-ce (stable, 2.10, false, false)	4m 37s
testing_mac_os (1.20, macos-12, 1.10.15)	23s
run-tests-ce (stable, master, false, false)	4m 56s
testing_mac_os (1.20, macos-14, brew)	3m 50s
run-tests-ce (master, true, 1.20)	5m 49s
testing_mac_os (stable, macos-12, brew)	6m 27s
run-tests-ce (master, true, 1.20, false)	4m 43s
testing_mac_os (stable, macos-12, 1.10.15)	22s
testing_mac_os (stable, macos-14, brew)	4m 24s
	1h 7m 43s

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