Support `per_repository` elector's health check failure message
What does this MR do?
Praefect's per_repository
election strategy outputs a different
log message when Praefect fails health checking a Gitaly node compared
to the sql
election strategy. The QA tests parse Praefect's logs to
to identify when Praefect has failed a health check. As it's not looking
for the new log messsage, the tests then fail as the suite doesn't identify
the health check failure. This commit fixes the situation by also taking
into account the message outputted by the per_repository
election strategy.
Failed job: https://gitlab.com/gitlab-org/gitlab-qa/-/jobs/1171128894
Relevant log line in Praefect: https://gitlab.com/gitlab-org/gitaly/-/blob/d2802ba45eddcfdcc306d6457200002aa6453ee3/internal/praefect/nodes/health_manager.go#L250