p90 alert does triggers on p100

### Environment SaaS (https://sentry.io/) ### Steps to Reproduce 1. Create a metric alert for transaction duration > p90 > 10 minute interval 2. Choose a specific transaction name and environment 3. Set the critical threshold to 30000 and the warning threshold to 10000 4. Receive 10 transactions with only one of them going over the warning threshold ### Expected Result The alert is not triggered. ### Actual Result The alert was triggered. A specific example can be found in the shadow ticket. ### Product Area Alerts ### Link _No response_ ### DSN _No response_ ### Version _No response_ ┆Issue is synchronized with this [Jira Improvement](https://getsentry.atlassian.net/browse/FEEDBACK-2316) by [Unito](https://www.unito.io)