record subtask end time

[lance6716]

Bug Report

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[ywqzzy]

All subtasks are affected

[D3Hunter]

not a bug, end_time is just added, hasn't implemented https://github.com/pingcap/tidb/pull/49020/files#diff-d337d4c9dc3da1a17f1792df53a00f6d59a5ea9977070d7068a7e248f674100a