No longer able to find tests on Windows in 23.2.0, after working in 23.1.0

[JoshuaKGoldberg]

🐛 Bug Report

$ jest --config ./test/unit/jest.config.js
No tests found
In D:\Code\WebClient\
  1319 files checked.
  testMatch: D:\Code\WebClient\src\**\?(*.)test.ts?(x) - 0 matches
  testPathIgnorePatterns: \\node_modules\\ - 1319 matches
Pattern:  - 0 matches
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

I promise you, I write unit tests! ☹

To Reproduce

Steps to reproduce the behavior:

• Use the following Jest config on Windows with a test under src\file.test.ts:

/*!
 * Copyright Microsoft Corporation. All rights reserved.
 */

const path = require("path");

module.exports = {
    collectCoverageFrom: [
        "src/*/**/*.ts*",
        "!src/*/**/*.stubs.ts*",
        "!src/typings/**",
    ],
    coverageDirectory: "./reports/coverage",
    globals: {
        "ts-jest": {
            tsConfigFile: "./tsconfig.test.json",
        },
    },
    moduleFileExtensions: [
        "js",
        "ts",
        "tsx",
    ],
    rootDir: path.join(__dirname, "../../"),
    setupTestFrameworkScriptFile: "<rootDir>/test/unit/setup",
    testMatch: [
        "<rootDir>/src/**/?(*.)test.ts?(x)",
    ],
    transform: {
        "^.+\\.tsx?$": "ts-jest",
    },
};

Expected behavior

Under 23.1.0, it finds test files.
Under 23.2.0, it does not.

Run npx envinfo --preset jest

Paste the results here:

 System:
    OS: Windows 10
    CPU: x64 Intel(R) Xeon(R) CPU E5-1650 v4 @ 3.60GHz
  Binaries:
    Yarn: 1.6.0 - C:\Program Files (x86)\Yarn\bin\yarn.CMD
    npm: 5.10.0 - D:\Code\WebClient\node_modules\.bin\npm.CMD

[JoshuaKGoldberg]

D'oh, duplicate of #6546.

[github-actions]

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