Use ES module exports (jestjs#4454)

* Use ESM exports in jest-config

* Use ESM exports in eslint-plugin-jest

* Use ESM exports in jest-changed-files

* Use ESM exports in jest-circus

* Use ESM exports in jest-diff

* Use ESM exports in jest-editor-support

* Use ESM exports in jest-haste-map

* Use ESM exports in jest-jasmine2

* Use ESM exports in jest-message-util

* Use ESM exports in jest-regex-util

* Use ESM exports in jest-repl

* Use ESM exports in jest-resolve

* Use ESM exports in jest-runner

* Use ESM exports in jest-runtime

* Use ESM exports in jest-snapshot

* Use ESM exports in jest-test-typescript-parser

* Use ESM exports in jest-util

* Use ESM exports in jest-validate

* Fix flow errors

* Activate eslint plugin to enforce correct ESM usage

* Use ESM exports in jest-cli

packages/jest-cli/src/lib/__tests__/is_valid_path.test.js

@@ -9,6 +9,8 @@
 
 import isValidPath from '../is_valid_path';
 
+import isValidPath from '../is_valid_path';
+
 const path = require('path');
 const {
   makeGlobalConfig,