refactor: organise TypeScript config and migrate helpers (#44747)

* feat: allow more 1000 steps to be created at once

* refactor: start migrating to typescript

* refactor: delete-step to ts

* refactor: migrated some helpers

* refactor: migrate create-empty-steps

* refactor: migrate create-step-between

* refactor: finish migrating to TS

* refactor: migrate tests

* fix: ensure mock.restore is done after each test

* fix: prevent double-tscing

* fix: repair the tests

* chore: use ts-node for scripts

We don't need the performance boost of incremental compilation and
ts-node is easier to work with

* refactor: consolidate tsconfigs

* refactor: replace gulp

* fix: use ts-node for build-curriculum

* fix: allow ts compilation of config

* feat: create and use create:config script

* fix: add /config to eslint projects

* fix: remove gulp script

tools/challenge-helper-scripts/helpers/get-project-path-metadata.test.ts

@@ -0,0 +1,36 @@
+import { readFileSync } from 'fs';
+import { getMetaData } from './get-project-path-metadata';
+
+jest.mock('fs', () => {
+  return {
+    readFileSync: jest.fn()
+  };
+});
+
+const mockPath = '/mock/path';
+
+describe('getMetaData helper', () => {
+  it('should process requested file', () => {
+    // @ts-expect-error - readFileSync is mocked
+    // eslint-disable-next-line @typescript-eslint/no-unsafe-call
+    readFileSync.mockImplementation(() => '{"name": "Test Project"}');
+
+    const expected = {
+      name: 'Test Project'
+    };
+
+    expect(getMetaData(mockPath)).toEqual(expected);
+  });
+
+  it('should throw if file is not found', () => {
+    // @ts-expect-error - readFileSync is mocked
+    // eslint-disable-next-line @typescript-eslint/no-unsafe-call
+    readFileSync.mockImplementation(() => {
+      throw new Error();
+    });
+
+    expect(() => {
+      getMetaData(mockPath);
+    }).toThrowError(new Error(`No _meta.json file exists at ${mockPath}`));
+  });
+});