jif 54c44b9ed4 Propagate tracing subscribers to exec start tasks (#32135) ...

## Why

The process-start background task can move to a Tokio worker thread, where the
caller's thread-local tracing subscriber is otherwise unavailable. This can
break propagation of the caller's trace context to the exec-server request.

## What changed

- Attach both the current span and current tracing subscriber to spawned
  process-start tasks.
- Run exec-server Bazel unit tests serially because their tracing setup uses
  process-global state.

## Testing

Run the trace-context regression test on a multi-thread Tokio runtime so it
exercises propagation across the background task.

GitOrigin-RevId: a586eefd6983916d670fc5a90f0decd0468d273b

2026-07-10 11:00:12 +00:00

759 B

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