Bulk delete traces

Delete traces matching a non-empty filter object. The endpoint resolves at most 1,000 trace IDs per request; requests matching more are rejected with 422. Use the query parameters for the canonical environment and time window; the same fields in the body only narrow that window. Only the documented filter fields and metadata__<key> are supported. The current server ignores unknown fields and invalid operators, which can broaden the deletion selection, so validate filters carefully before sending them. ClickHouse deletion is asynchronous, so success_count and deleted_count report traces submitted for deletion, not confirmation that every row has already disappeared. Rate limit: 10 requests per minute per organization and exact endpoint path for API-key calls (shared across API keys), and per user and exact endpoint path for JWT calls.