Clone challenges api (#9684)

* Added clone api

* Added new clone UI

* Fixed challenge clone

* Fixed lint and added mongo toObject

* Removed clone field, fixed type, fixed challenge task query

* Auto selected group

* Accounted for group balance when creating challenge

* Added check for if user is leader of guild

* Added leader existence check

* Added fix for leader and prizecost equal to

test/api/v3/integration/challenges/POST_challenges_id_clone.test.js

@@ -0,0 +1,43 @@
+import {
+  generateUser,
+  generateGroup,
+} from '../../../../helpers/api-v3-integration.helper';
+
+describe('POST /challenges/:challengeId/clone', () => {
+  it('clones a challenge', async () => {
+    const user = await generateUser({balance: 10});
+    const group = await generateGroup(user);
+
+    const name = 'Test Challenge';
+    const shortName = 'TC Label';
+    const description = 'Test Description';
+    const prize = 1;
+
+    const challenge = await user.post('/challenges', {
+      group: group._id,
+      name,
+      shortName,
+      description,
+      prize,
+    });
+    const challengeTask = await user.post(`/tasks/challenge/${challenge._id}`, {
+      text: 'test habit',
+      type: 'habit',
+      up: false,
+      down: true,
+      notes: 1976,
+    });
+
+    const cloneChallengeResponse = await user.post(`/challenges/${challenge._id}/clone`, {
+      group: group._id,
+      name: `${name} cloned`,
+      shortName,
+      description,
+      prize,
+    });
+
+    expect(cloneChallengeResponse.clonedTasks[0].text).to.eql(challengeTask.text);
+    expect(cloneChallengeResponse.clonedTasks[0]._id).to.not.eql(challengeTask._id);
+    expect(cloneChallengeResponse.clonedTasks[0].challenge.id).to.eql(cloneChallengeResponse.clonedChallenge._id);
+  });
+});