fix: Watchdog wait for the current run to complete on shutdown. #1337
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This is an enhancement to googleapis/gax-java#1890. Watchdog wait for the current run to complete on shutdown. Using Phaser to track the lifecycle of each run() execution, wait for the Phaser to proceed to next phase(which is terminated phase in our case) in awaitTermination and use phaser.isTerminated() to determine if Watchdog is terminated or not.