(fix)[deleteJob] It will not dispatch task when backend has been drop…#59569

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ghkang98 wants to merge 3 commits intoapache:masterfrom

ghkang98:fix-delete-job

Commits on Jan 5, 2026

(fix)[deleteJob] It will not dispatch task when backend has been dropped or not alive on delete from command.
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Commits on Jan 8, 2026

(fix)[downcount] lazy init the downcount instance keep the mark size equal count.
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Commits on Jan 14, 2026

(fix)[MarkedCountDownLatch] drop countdown function and add unit test.
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