[Opt](Variant) merge schema in sync_rowsets to prevents from CPU overhead each time describe table(#42856) #43062
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…head each time describe table (#42856) Should prevent from merge schema each time calling `merged_tablet_schema`. So this pr put the merge logic in `sync_rowsets` stage.
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eldenmoon
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PR Body: Should prevent from merge schema each time calling
merged_tablet_schema. So this pr put the merge logic insync_rowsetsstage.Cherry-picked from #42856