planner: fix idxMergePartPlans forget to deal with RootTaskConds (#58507)#58519

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ti-chi-bot wants to merge 1 commit intopingcap:release-8.1from ti-chi-bot:cherry-pick-58507-to-release-8.1

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Commits on Dec 25, 2024

This is an automated cherry-pick of pingcap#58507

hawkingrei
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