Backport: Throttler: keep watching topo even on error (#18223)#222

brendar merged 1 commit intov18.0.8-shopify-3Shopify/vitess:v18.0.8-shopify-3from

backport-topo-throttler-watch-fix-to-v18Shopify/vitess:backport-topo-throttler-watch-fix-to-v18Copy head branch name to clipboard