fix: repair missing action rows on status update - #7812

Summary

• return a repository-level ErrActionNotFound when UpdateActionPhase matches no row and the action truly does not exist
• map that sentinel to a NotFound status in InternalRunService.UpdateActionStatus
• make the actions watcher re-record the TaskAction and retry UpdateActionStatus when the run service reports NotFound
• preserve stale/backward phase no-op behavior by checking row existence before returning NotFound

Fixes #7257.

Testing

• GOCACHE=/private/tmp/flyte-go-cache GOMODCACHE=/private/tmp/flyte-go-mod-cache go test ./actions/k8s -run 'TestNotifyRunService_RecordAndRetryWhenStatusUpdateReturnsNotFound$'\n- GOCACHE=/private/tmp/flyte-go-cache GOMODCACHE=/private/tmp/flyte-go-mod-cache go test ./runs/service -run 'TestUpdateActionStatus_MissingActionReturnsNotFoundStatus$'\n- GOCACHE=/private/tmp/flyte-go-cache GOMODCACHE=/private/tmp/flyte-go-mod-cache go test ./runs/repository/impl -run 'TestUpdateActionPhase_(MissingActionReturnsNotFound|BlocksBackwardFromSucceeded)$'