test: reduce flakiness by taking control of environment

[LewisCowlesMotive]

I use vs code with auto-attach, which creates data in STDERR This controls the ENV passed through to child-process Technically I think it improves the test:

Before

test/process-exit.test.js ............................. 2/3
  log with rotating file stream will terminate
  not ok should be equal
    --- wanted                                                                       
    +++ found                                                                        
    +Debugger listening on ws://127.0.0.1:64184/64dcdc5d-8cbd-407a-aed4-32c4b033d814 
    +For help, see: https://nodejs.org/en/docs/inspector                             
    +Debugger attached.                                                              
    +Waiting for the debugger to disconnect...                                       
    compare: '==='
    at:
      line: 23
      column: 15
      file: test/process-exit.test.js
    stack: |
      test/process-exit.test.js:23:15
      ChildProcess.exithandler (node:child_process:390:7)
      ChildProcess.emit (node:events:527:28)
      maybeClose (node:internal/child_process:1092:16)
      Process.ChildProcess._handle.onexit (node:internal/child_process:302:5)
    source: |
      t.equal(stderr, '');

After

test/process-exit.test.js ...Waiting for the debugger to disconnect...
Debugger listening on ws://127.0.0.1:64396/e1e9cf0b-2827-4ccb-b2be-b7c848953d3d
For help, see: https://nodejs.org/en/docs/inspector
Debugger attached.
test/process-exit.test.js ............................. 3/3

So technically what is happening is that the child process was receiving some ENV which told it to debug. I initially tried setting LOG_LEVEL=fatal, without passing anything from process.env; this was a mistake, as process.env.PATH is needed (at least on my machine) to use nodejs. So with that sent in, and a bit of pokery to get npm run check passing, this should meet standards.

[LewisCowlesMotive]

Question?

Shouldn't all the child processes in tests follow suit here?