[fix](Export) fix dead lock of parallel Exporting (#43083) #43402
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Problem Summary: There are 2 locks, lock of ExportMgr and lock of ExportJob(synchronized lock). Previously, the lock order is wrong: 1. When cancelling job, it will first get job lock, then getting mgr lock. 2. When removing old job, it will first get mgr lock, then getting job lock. This PR fix it by always getting job lock after mgr lock, to avoid dead lock.
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cherry-pick #43083