[Fix-18197][Master] Fix master failover releasing wrong lock path#18207
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The per-master failover lock was acquired at /lock/master-failover/<masterAddress> but released at the parent path /lock/master-failover, so the per-master lock node was never released and blocked subsequent failover from peer masters. * RegistryClient#getLock now returns an AutoCloseable RegistryLock, enforcing acquire/release symmetry via try-with-resources. * RegistryClient#releaseLock(String) is removed; callers use the returned handle. * FailoverCoordinator#doMasterFailover stores the lock path in a local variable and uses try-with-resources.
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close #18197
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