feat: Emit low-cardinality pageload span names when streaming spans - #23424

Bugbot Analysis Progress (49s elapsed)

✅ Gathered PR context (6s)
✅ Completed bug detection (42s)
✅ Posted analysis results (1s)

Final Result: Bugbot completed review - no issues found. 1 previously reported issue remain unresolved.

Request ID: serverGenReqId_d349418d-5947-40b5-b3a4-633a5e62b3d1