Monitor app health during Korifi upgrade

[georgethebeatle]

Background

One of the important aspects of undisruptive Korifi updates is that we do not cause applications downtime. Currently CI ensures that main branch can be deployed on top of the latest Korifi release, but does not check for apps downtime.

Actions to take

CI should check for apps downtime when upgrading Korifi.
Bonus points: if that check fails, mark the issue a commit fixes with the disruptive label.

[danail-branekov]

We have implemented a job to check for the age of a long-living app pod: https://ci.korifi.cf-app.com/teams/main/pipelines/main/jobs/check-long-living-app/