[SUPPORT] Compact according to precombinekey in the RealtimeCompactedRecordReader class

[zyp0818]

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Describe the problem you faced

Compact according to precombineKey in the RealtimeCompactedRecordReader class.
The current logic is to think that the data in the logFile is the latest, and overwrite the record in the baseFile with the record in the logFile.

[nsivabalan]

thanks for the issue. I see you have already raised a PR #5509. will go ahead and close out the issue.