jif fc953e5234 Stabilize the detached exec-server session resume test (#42306) ...

## Why

Closing the client WebSocket does not guarantee that the server has finished
detaching its session, so an immediate resume attempt can race with cleanup.

## What changed

- Keep the test process alive through piped stdin instead of a fixed sleep.
- Retry session initialization when the server reports that the session is still
  attached, with a five-second timeout.
- Surface unexpected JSON-RPC errors with their response details.

GitOrigin-RevId: 1f5c2bf21719365262e6fa9f4c21e7c3f81a5729

2026-09-02 16:40:09 +00:00

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