[Feature request]: Add per-worker thresholds for N+1 query detection

### Problem Statement Currently, Sentry applies N+1 query detection thresholds globally at the project level. While you can adjust the overall threshold in Settings → Performance, there’s no way to tune detection sensitivity for specific background workers or tags. The customer would like to request more granular controls so that different workloads can have different N+1 time thresholds. ## Feedback from the customer 300ms is a very reasonable duration for queries that need to result in responses to users. But we rely on workers to offload long-running actions that might actually involve equally long-running DB-queries. These should still be monitored but allowed a longer duration. ### Solution Brainstorm _No response_ ### Product Area Performance