Package: Validate challenges on test (#17216)

This PR allows us to validate the schema during test.

It also removes some cruft from the seed files and ensures only the required data is packaged and consumable, reducing the package weight somewhat.

test-challenges.js

@@ -8,6 +8,7 @@ import getChallenges from './getChallenges';
 import MongoIds from './mongoIds';
 import ChallengeTitles from './challengeTitles';
 import addAssertsToTapTest from './addAssertsToTapTest';
+import { validateChallenge } from './schema/challengeSchema';
 
 // modern challengeType
 const modern = 6;
@@ -203,6 +204,15 @@ function createTest({
 }
 
 Observable.from(getChallenges())
+  .do(({ challenges }) => {
+    challenges.forEach(challenge => {
+      const result = validateChallenge(challenge);
+      if (result.error) {
+        console.log(result.value);
+        throw new Error(result.error);
+      }
+    });
+  })
   .flatMap(challengeSpec => {
     return Observable.from(challengeSpec.challenges);
   })