[Bug]: --workerIdleMemoryLimit doesn't work with --maxWorkers 1

[benjaminjkraft]

Version

29.3.1

Steps to reproduce

Run a bunch of tests with --maxWorkers 1 --workerIdleMemoryLimit 1kb --logHeapUsage. Memory usage will go up way beyond 1kb.

Expected behavior

I expect the worker to be restarted after every test with a low worker idle memory limit. Obviously this doesn't work with --runInBand but with --maxWorkers 1 it should!

Actual behavior

The worker is never restarted.

Additional context

It looks like #13168 and/or #13171 were proposed to fix this, but neither was merged.

Environment

System:
    OS: macOS 13.1
    CPU: (10) x64 Apple M1 Max
  Binaries:
    Node: 16.17.1 - /nix/store/fyaisfdhkviz6sb628qxlmy5wcasqfhq-nodejs-16.17.1/bin/node
    npm: 8.12.1 - ~/.local/bin/npm
  npmPackages:
    jest: 29.3.1 => 29.3.1 

(also in our CI env which is linux on CircleCI)