Fix sample collection when using worker threads

[jasnell]

When sampler.js is running in a worker thread, redirect processstat to a different file and suppress the systeminfo file.

@goto-bus-stop .. in my local environment I'm seeing a failure in certain tests that do not appear to be directly related but might be...

 PASS  test/analysis-cpu.test.js 40 OK 1s
 PASS  test/analysis-delay.test.js 8 OK 45.155ms
 PASS  test/analysis-guess-interval.test.js 16 OK 56.536ms
 PASS  test/analysis-handles.test.js 12 OK 50.897ms
 PASS  test/analysis-issue-category.test.js 20 OK 27.577ms
 PASS  test/analysis-memory.test.js 11 OK 93.541ms
 PASS  test/analysis.test.js 10 OK 1s
 PASS  test/cmd-collect-analysing-worker.test.js 4 OK 587.209ms
 PASS  test/cmd-collect-analysing.test.js 4 OK 440.233ms
 PASS  test/cmd-collect-detect-port.test.js 6 OK 600.236ms
test/cmd-collect-exit.test.js 2> process exited with exit code 1
 SKIP  test/cmd-collect-exit.test.js
 ~ cmd - collect - external SIGINT is relayed > Skip test as we cannot easily send SIGINT on Windows

 SKIP  test/cmd-collect-exit.test.js
 ~ cmd - collect - SIGKILL causes error > Skip test as SIGKILL also sends exit code 1 on Windows

 SKIP  test/cmd-collect-exit.test.js 2 skip of 3 392.024ms
 ~ cmd - collect - external SIGINT is relayed > Skip test as we cannot easily send SIGINT on Windows
 ~ cmd - collect - SIGKILL causes error > Skip test as SIGKILL also sends exit code 1 on Windows

 PASS  test/cmd-collect-node-options-env.test.js 2 OK 2s
 PASS  test/cmd-collect-node-path-env.test.js 2 OK 2s
 PASS  test/cmd-collect-sample-interval.test.js 2 OK 1s
 PASS  test/cmd-collect.test.js 11 OK 2s
 PASS  test/cmd-no-cluster.test.js 3 OK 3s
 FAIL  test/cmd-visualize.test.js 1230 OK 50s
  command: C:\Users\jasne\AppData\Local\nvs\node\13.11.0\x64\node.exe
  args:
    - -r
    - C:\Users\jasne\Projects\clinic\node-clinic-doctor\node_modules\esm\esm.js
    - test/cmd-visualize.test.js
  exitCode: null
  signal: SIGTERM

 PASS  test/collect-get-logging-paths.test.js 8 OK 84.679ms
 PASS  test/collect-process-stat.test.js 10 OK 496.138ms
 PASS  test/collect-system-info.test.js 5 OK 27.585ms
 PASS  test/format-process-stat.test.js 9 OK 49.158ms
 PASS  test/format-system-info.test.js 1 OK 36.129ms
 PASS  test/format-trace-event.test.js 2 OK 44.636ms
 PASS  test/lib-destroyable-stream.test.js 20 OK 46.163ms
 PASS  test/recommendation.test.js 62 OK 224.213ms

[jasnell]

10.x tests failed because worker_threads is still behind a flag on 10.x

Not sure why the 13.x test failed. Appears unrelated.

[esmorodin]

Confirm, that this fix works, because otherwise I faced this error: clinicjs/node-clinic#414.
Node version: bash-3.2$ node -v v18.12.0
FYI @jasnell

[RafaelGSS]

This probably needs a rebase. Once the test passes, we can merge it.