[Fix] Manually trigger savepoint and save after success #4280
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I noticed that this issue has been fixed in previous versions, but I found that 2.1.6 still has this problem. Through Git history, I found that this part of the code was deleted later. What is the reason for this? Although it is difficult to use this feature frequently, when manually triggering savepoint, I found that there are operation logs but no savepoint path recorded, so I cannot use this savepoint to start the Flink task
What changes were proposed in this pull request
Issue Number: close #3493
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This change is a trivial rework / code cleanup without any test coverage.
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