[CELEBORN-1721][CIP-12] Support HARD_SPLIT in PushMergedData #2924
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What changes were proposed in this pull request?
As title.
Why are the changes needed?
https://docs.google.com/document/d/1Jaix22vME0m1Q-JtTHF9WYsrsxBWBwzwmifcPxNQZHk/edit?tab=t.0#heading=h.iadpu3t4rywi
(Thanks to @cfmcgrady @littlexyw @ErikFang @waitinfuture @RexXiong @FMX for their efforts on the proposal)
Does this PR introduce any user-facing change?
The response of pushMergedData has been modified, however, the changes are backward compatible.
How was this patch tested?
UT: org.apache.celeborn.service.deploy.cluster.PushMergedDataHardSplitSuite