"Notify users" escalation should allow sending to a team

[TheSkorm]

What would you like to see!

Maybe I'm missing something fundamental but it seems OnCall doesn't support a way to escalate to a team?

The use case here would be something like:

• Existing escalation rules
• Wait for 30 minutes
• Escalate to second team (Notify users to a team rather than individual users)

Product Area

Other

Anything else to add?

Coupled with this bug/issue #3081 it makes escalating issues to another team very hard to do without annoying people.

Documentation at https://grafana.com/docs/oncall/latest/escalation-chains-and-routes/ says

Notify users - send a notification to a user or a group of users.
however groups of users doesn't seem to mean teams.

This could also imply to:

Notify users one by one (round robin)

[github-actions]

The current version of Grafana OnCall, at the time this issue was opened, is v1.3.62. If your issue pertains to an older version of Grafana OnCall, please be sure to list it in the PR description. Thank you 😄!