feat: update challenge helpers to handle id filenames (#44769)

* refactor: light tweaks for readability

* refactor: simplify metadata functions

* fix: most tests

* test: fix utils tests

* test: simplify mocks

* WIP: update get-last-step-file-content

* feat: finish create-next-step

* fix: type error

* test: provide mock meta.json for test

* refactor: get meta path from project path

* refactor: get project name from path

* refactor: simplify getProjectMetaPath further

Also removes some excessive mocking

* refactor: remove more mocks, always clear .env

* feat: update create-next-step

* feat: update create-empty steps

Also refactors slightly, so it's easier to insert steps into the meta

* docs: update challenge-helper-script docs

* feat: create-step-between

* refactor: allow metadata parse errors to propagate

* fix: convert reorderSteps to renameSteps

* refactor: create-step-between -> insert-step

* feat: update delete-step

* refactor: consolidate commands into commands.ts

* refactor: clean up and consolidation

* refactor: more cleanup

* fix: make cli args consistent

Everything accepts a single integer and nothing else

* refactor: renameSteps -> updateStepTitles

* docs: update with the names and args

* feat: add step validating meta + files are synced

tools/challenge-helper-scripts/helpers/get-arg-value.test.ts

@@ -0,0 +1,18 @@
+import { getArgValue } from './get-arg-value';
+
+describe('getArgValue helper', () => {
+  it('should throw if there no arguments', () => {
+    const args = ['/Path/to/node', '/Path/to/script'];
+    expect(() => getArgValue(args)).toThrow('only one argument allowed');
+  });
+
+  it('should throw if the argument is not an integer', () => {
+    expect.assertions(3);
+    const args = ['/Path/to/node', '/Path/to/script', 'num=4'];
+    expect(() => getArgValue(args)).toThrow('argument must be an integer');
+    const args2 = ['/Path/to/node', '/Path/to/script', '4.1'];
+    expect(() => getArgValue(args2)).toThrow('argument must be an integer');
+    const args3 = ['/Path/to/node', '/Path/to/script', '4'];
+    expect(getArgValue(args3)).toBe(4);
+  });
+});