`slack-15.0`: backport `vtgate` buffer fix vitessio/vitess#13856#377

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timvaillancourt merged 3 commits intoslack-15.0from

bp-pr13856-slack-15.0

May 28, 2024

Commits on May 28, 2024

bugfix: fix nil pointer in vtgate on topo connection error (#13010)

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timvaillancourt
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VTGate Buffering: Use a more accurate heuristic for determining if we're doing a reshard (#13856)

mattlord
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timvaillancourt
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Merge branch 'slack-15.0' into bp-pr13856-slack-15.0
timvaillancourt
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