Metric Alerts - Set an alert based on the volume of errors that are assigned to a certain team

### Problem Statement As a developer from a certain team, I want to set up an metric alert when the amount of errors that are connected to my team / or team X has been surpassed. ### Solution Brainstorm It looks like we have the [amount of events for a specific team](https://docs.sentry.io/api/teams/retrieve-event-counts-for-a-team/) already, so I assume this can be realised under the hood ### Product Area Alerts ┆Issue is synchronized with this [Jira Improvement](https://getsentry.atlassian.net/browse/FEEDBACK-1861) by [Unito](https://www.unito.io)