[release-21.0] VReplication: Address SwitchTraffic bugs around replication lag and cancel on error (#17616)#17644

Merged

rohit-nayak-ps merged 2 commits intorelease-21.0from backport-17616-to-release-21.0

Jan 29, 2025

+276-65

Commits on Jan 28, 2025

Cherry-pick 39a0ddd with conflicts

vitess-bot[bot]
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vitess-bot
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Fix conflicts
mattlord
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