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-meta-path.ts

@@ -0,0 +1,25 @@
+import path from 'path';
+
+// Returns the path of the meta file associated to arguments provided.
+const getProjectMetaPath = (
+  curriculumPath: string,
+  projectName: string
+): string => {
+  if (typeof curriculumPath !== 'string' || typeof projectName !== 'string') {
+    throw `${curriculumPath} and ${projectName} should be of type string`;
+  }
+
+  if (!projectName) {
+    throw `${projectName} can't be an empty string`;
+  }
+
+  return path.resolve(
+    curriculumPath,
+    'challenges',
+    '_meta',
+    projectName,
+    'meta.json'
+  );
+};
+
+export { getProjectMetaPath };