Investigate why spec/frontend/achievements/achievements_form_spec.js throws error after test environment was torn down with vue@3

Steps to investigate:

1. VUE_VERSION=3 yarn run jest spec/frontend/achievements/achievements_form_spec.js --no-skip-vue3

Example job:

ReferenceError: You are trying to access a property or method of the Jest environment after it has been torn down. From spec/frontend/achievements/achievements_form_spec.js.
      17 |   new Promise(setImmediate).then(() => {
      18 |     // wait for pending setTimeout()s
    > 19 |     jest.runOnlyPendingTimers();
         |          ^
      20 |   }),
      21 | );
      22 |
      at runOnlyPendingTimers (spec/frontend/test_setup.js:19:10)

[...snip...]

 FAIL  spec/frontend/achievements/achievements_form_spec.js
  ● Test suite failed to run
    Unhandled Promise rejections: Error: Caught error after test environment was torn down
    expect(jest.fn()).toHaveBeenCalledWith(...expected)
    Expected: "Achievement has been added."
    Number of calls: 0, Error: Caught error after test environment was torn down
    Cannot call text on an empty VueWrapper., Error: Caught error after test environment was torn down
    Cannot call text on an empty VueWrapper., Error: Caught error after test environment was torn down
    expect(jest.fn()).toHaveBeenCalledWith(...expected)
    Expected: {"input": {"avatar": {}, "name": "Achievement", "namespaceId": "gid://gitlab/Group/7"}}
    Number of calls: 0
      at tearDownEnv (node_modules/jest-runner/build/runTest.js:286:7)