Remove unnecessary `finalizeEpoch` modifier from `migrateTo` #252

Job	Run time
lint	34s
build	19s
test	4m 29s
coverage	1h 36m 1s
verify (verify:stake_vault)	7m 35s
verify (verify:stake_manager)	30m 36s
verify (verify:stake_manager_process)	4m 4s
verify (verify:stake_manager_start_migration)	9m 10s
	2h 32m 48s

Provide feedback