[Feature Request] Upsert command for alertsConditions

[anbarasantr]

What
I would like to have upsert command for alert condition. It creates an alerts conditions if it is not already there else it updates the existing alert based on the name.

Why
It helps to manage the alerts through gitops with minimal effort. (We don't need to check if the alert is already created or not before applying the changes. It will make the gitops jobs idempotent.

I intend to create the PR for this myself, if you all don't mind. I'll start on that if I get >=1 👍 react from a Contributor