Very large portion of the sidekiq jobs running >1s are ApplyIncidentSlaExceededLabelWorker

During investigation of gitlab-com/gl-infra/production#5054 (closed), the performance of ApplyIncidentSlaExceededLabelWorker was highlighted.

Logs from jobs running >1s: https://log.gprd.gitlab.net/app/discover#/?_g=h@c7ad349&_a=h@37ea0f3

This should be investigated for opportunities to decrease the runtime/corresponding sidekiq burden.