Roll-up through 2025/04/01.
- Flamegraph and drill-in menu improvements
- Performance improvements around unhandled event dispatch
- Add configurable real-time delay in TraceLogEventSource
- Don't queue another flush during a real-time ETW session if one is already in-process
- Allow configuration of rundown providers for real-time EventPipe sessions
- Fix stack handling for NetTrace V4
- Add multi-line view for events viewer
- Misc accessibility fixes