Include missing cjs and mjs files from collectCoverageFrom

Those file are transformed and usable in node and webpack. Their transpiled javascript will be included in production build, so we need to be able to see how they are covered inside nyc output.

packages/react-scripts/scripts/utils/createJestConfig.js

@@ -25,7 +25,7 @@ module.exports = (resolve, rootDir, isEjecting) => {
   const config = {
     roots: ['<rootDir>/src'],
 
-    collectCoverageFrom: ['src/**/*.{js,jsx,ts,tsx}', '!src/**/*.d.ts'],
+    collectCoverageFrom: ['src/**/*.{js,jsx,mjs,cjs,ts,tsx}', '!src/**/*.d.ts'],
 
     setupFiles: [
       isEjecting