[`slack-22.0`] Vttablet bug fixes from v22.0.2#748

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tanjinx wants to merge 2 commits intoslack-22.0from

vttablet-bug-fixes

Commits on Nov 13, 2025

[release-22.0] Fix `vttablet` not being marked as not serving when MySQL stalls (#17883) (#18454)

vitess-bot[bot]
authored and
tanjinx
committed
[release-22.0] repltracker: reset replica lag when we are primary (#18800) (#18806)

vitess-bot[bot]
authored and
tanjinx
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