[Bug]: don't use workers in watch mode if --runInBand is specified

[cdoublev]

Version

29.7.0

Steps to reproduce

1. Clone https://github.com/cdoublev/jest-issue
2. Run node --inspect-brk=0.0.0.0:9222 ./node_modules/.bin/jest --watchAll --runInBand (or npm test)
3. Open chrome://inspect/ in Chrome
4. Click inspect in the target list

Expected behavior

I expect the code to break at the debugger line in ./add.js.

Actual behavior

The code did not break.

Additional context

Follow-up on #14085 (comment).

Environment

System:
  OS: Linux 6.1 Debian GNU/Linux 12 (bookworm) 12 (bookworm)
  CPU: (1) x64 Intel(R) Core(TM) i7-3612QM CPU @ 2.10GHz
Binaries:
  Node: 20.5.1 - /usr/bin/node
  npm: 9.8.0 - /usr/bin/npm
npmPackages:
  jest: ^29.7.0 => 29.7.0

[github-actions]

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[SimenB]

https://github.com/jestjs/jest/releases/tag/v30.0.0-alpha.1