Optimize deferrable mode execution in GCSObjectsWithPrefixExistenceSensor
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potiuk
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In deferrable mode for GCSObjectsWithPrefixExistenceSensor, we should first check if file with given prefix is available or not in the execute method and only defer if that results in False. This way we don’t run an unnecessary deferral cycle if the condition is already true.
cc @dstandish
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