switch to using async-profiler from upstream

[arielb1]

Pollcatch should be supported in upstream async-profiler now,

However, there were some issues in CI, see https://github.com/async-profiler/rust-agent/actions/runs/16660926393/job/47157690338?pr=83

[arielb1]

The error is

  2025-07-31T22:09:59.116531Z ERROR async_profiler_agent::profiler: error during profiling, stopping, err: JfrRead(Custom { kind: Other, error: "background task failed" })
    at src/profiler.rs:542

Looks like a weird interaction with tokio::fs::read

[arielb1]

Looks like a weird interaction with tokio::fs::read

This is just expected shutdown behavior.

The problem is that nativemem profiling does not work after async-profiler/async-profiler#1264