fix: clean failed challenges (#37526)

client/src/redux/failed-updates-epic.js

@@ -19,6 +19,7 @@ import {
 } from './';
 import postUpdate$ from '../templates/Challenges/utils/postUpdate$';
 import { isGoodXHRStatus } from '../templates/Challenges/utils';
+import { backEndProject } from '../../utils/challengeTypes';
 
 const key = 'fcc-failed-updates';
 
@@ -26,6 +27,10 @@ function delay(time = 0, fn) {
   return setTimeout(fn, time);
 }
 
+// check if backenEndProjects have a solution
+const isSubmitable = failure =>
+  failure.payload.challengeType !== backEndProject || failure.payload.solution;
+
 function failedUpdateEpic(action$, state$) {
   const storeUpdates = action$.pipe(
     ofType(types.updateFailed),
@@ -45,7 +50,16 @@ function failedUpdateEpic(action$, state$) {
     filter(() => store.get(key)),
     filter(() => isOnlineSelector(state$.value)),
     tap(() => {
-      const failures = store.get(key) || [];
+      let failures = store.get(key) || [];
+
+      let submitableFailures = failures.filter(isSubmitable);
+
+      // delete unsubmitable failed challenges
+      if (submitableFailures.length !== failures.length) {
+        store.set(key, submitableFailures);
+        failures = submitableFailures;
+      }
+
       let delayTime = 100;
       const batch = failures.map((update, i) => {
         // we stagger the updates here so we don't hammer the server