test: fix debugger probe throwing getter flake

[trivikr]

Fixes a flaky debugger probe test seen in the macOS unusual-character path CI rerun.

The fixture previously placed both probe target statements at top level. If the
target script ran before those breakpoints were bound, both probes could be
missed and the fixture would stay alive until probe mode timed out.

This moves the target statements into the fixture's existing interval so they
remain available until the completion probe runs and clears the interval.

Refs: https://github.com/nodejs/node/actions/runs/27588057763/job/81562704514

Error Log

=== release test-debugger-probe-expression-throws ===
Path: parallel/test-debugger-probe-expression-throws
Error: --- stderr ---
[process 60703]: --- stderr ---
INSPECT_PROBE 60703: child stderr: "Debugger listening on ws://127.0.0.1:63110/03881a62-edc2-43dd-adc8-dd61c7d6367c\nFor help, see: [https://nodejs.org/learn/getting-started/debugging\n](https://nodejs.org/learn/getting-started/debugging/n)"
INSPECT_PROBE 60703: child stderr: "Debugger attached.\n"
INSPECT_PROBE 60703: CDP -> Runtime.enable
INSPECT_PROBE 60703: CDP <- Runtime.enable (success)
INSPECT_PROBE 60703: CDP -> Debugger.enable
INSPECT_PROBE 60703: CDP <- Debugger.enable (success)
INSPECT_PROBE 60703: CDP -> Debugger.setBreakpointByUrl
INSPECT_PROBE 60703: CDP <- Debugger.setBreakpointByUrl (success)
INSPECT_PROBE 60703: breakpoint set: id=2:15:0:^(.*[\/\\])?probe-throwing-getter\.js$ urlRegex=^(.*[\/\\])?probe-throwing-getter\.js$ locations=[]
INSPECT_PROBE 60703: CDP -> Debugger.setBreakpointByUrl
INSPECT_PROBE 60703: CDP <- Debugger.setBreakpointByUrl (success)
INSPECT_PROBE 60703: breakpoint set: id=2:16:0:^(.*[\/\\])?probe-throwing-getter\.js$ urlRegex=^(.*[\/\\])?probe-throwing-getter\.js$ locations=[]
INSPECT_PROBE 60703: CDP -> Runtime.runIfWaitingForDebugger
INSPECT_PROBE 60703: CDP <- Runtime.runIfWaitingForDebugger (success)
INSPECT_PROBE 60703: timeout fired: finished=false, inFlight=null, lastProbeIndex=null
INSPECT_PROBE 60703: finish: exitCode=1, terminal=timeout

[process 60703]: --- stdout ---
{"v":2,"probes":[{"expr":"holder.throwingGetter","target":{"suffix":"probe-throwing-getter.js","line":16}},{"expr":"markProbesDone()","target":{"suffix":"probe-throwing-getter.js","line":17}}],"results":[{"event":"timeout","pending":[0,1],"error":{"code":"probe_timeout","message":"Timed out after 30000ms waiting for probes: probe-throwing-getter.js:16, probe-throwing-getter.js:17"}}]}

[process 60703]: status = 1, signal = null
/Users/runner/work/node/node/dir%20with $unusual"chars?'åß∂ƒ©∆¬…`/test/common/child_process.js:112
    throw error;
    ^

Error: - process terminated with status 1, expected 0
    at Object.<anonymous> (/Users/runner/work/node/node/dir%20with $unusual"chars?'åß∂ƒ©∆¬…`/test/parallel/test-debugger-probe-expression-throws.js:21:1)
    at Module._compile (node:internal/modules/cjs/loader:1947:14)
    at Object..js (node:internal/modules/cjs/loader:2087:10)
    at Module.load (node:internal/modules/cjs/loader:1669:32)
    at Module._load (node:internal/modules/cjs/loader:1450:12)
    at wrapModuleLoad (node:internal/modules/cjs/loader:260:19)
    at Module.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:154:5)
    at node:internal/main/run_main_module:33:47 {
  options: {
    cwd: '/Users/runner/work/node/node/dir%20with $unusual"chars?\'åß∂ƒ©∆¬…`/test/fixtures/debugger',
    env: { NODE_DEBUG: 'inspect_probe' }
  },
  command: '/Users/runner/work/node/node/dir%20with $unusual"chars?\'åß∂ƒ©∆¬…`/out/Release/node inspect --json --probe probe-throwing-getter.js:16 --expr holder.throwingGetter --probe probe-throwing-getter.js:17 --expr markProbesDone() probe-throwing-getter.js'
}

---

Assisted-by: openai:gpt-5.5

[joyeecheung]

It doesn't appear to me this would fix anything, the binding behavior should be very deterministic and I don't think they can cause any intermittent timeouts. Judging from the logs, the timeout is still caused by the same thing (paused event not being delievered) that had been haunting interactive tests too.

Have you verified in any way that this indeed fix the flake in github actions? It would be better use of both our time to not have this kind of PRs that don't seem to make much sense other than some AI-generated reasoning that isn't properly verified by a human being and doesn't hold up under scrutiny.

[trivikr]

Thank you, Joyee, for the review.

I agree that AI-generated reasoning not properly verified by a human being is not helpful,
and it is not a good use of maintainer time.

I've closed the other AI-assisted PRs created for the debugger subsystem.
I couldn't find a central issue which discussed this, so I created a new one in #64116 highlighting the question.

If I use AI assistance for looking into any debugger related flaky tests, I'll post the findings on the issue instead of creating new PRs.