test: enlarge TestRegionLabelDenyScheduler timeout #20918

Job	Run time
chunks (1, Unit Test(1))	5m 5s
chunks (2, Unit Test(2))	3m 41s
chunks (3, Unit Test(3))	5m 4s
chunks (4, Tests(1))	4m 55s
chunks (5, Tests(2))	4m 37s
chunks (6, Tools Test)	4m 55s
chunks (7, Client Integration Test)	4m 55s
chunks (8, TSO Integration Test)	4m 45s
chunks (9, MicroService Integration(!TSO))	3m 50s
chunks (10, MicroService Integration(TSO))	4m 59s
report-coverage	0s
	46m 46s

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