[fix][client] Fix UnAckedMessageRedeliveryTracker to skip cancelled timeouts

[Dream95]

Motivation

UnAckedMessageTracker already guards its periodic ack-timeout TimerTask with Timeout.isCancelled() to avoid executing after cancellation. UnAckedMessageRedeliveryTracker had the same scheduling pattern but lacked this guard, so a cancelled timeout callback could still run and trigger unnecessary redelivery/rescheduling work.

Modifications

Add the t.isCancelled() fast-path return to UnAckedMessageRedeliveryTracker TimerTask.run(...).

Verifying this change

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• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The threading model
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• The admin CLI options
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