Notifications: Links to challenge from notifications must be in new format

[SathyaJayabal]

User cred: jcori/appirio123

1. Go to Notifications page https://test-community-app.topcoder-dev.com/notifications
   or

2. Open notifications popup from header.

3. Click on challenge related notification

expected url format:https://test-community-app.topcoder-dev.com/challenges/2b8e84ea-656c-4ee5-bf1d-7030b50d2e9a
actual url format:https://test-community-app.topcoder-dev.com/challenges/30048648

notif.mov.zip

[sushilshinde]

This will be done from the backend as well as #4435

[sachin-maheshwari]

@SathyaJayabal @sushilshinde FYI,
As discussed with @mtwomey, once the issue #4435 get fixed, this issue priority automatically will down from P1.

[SathyaJayabal]

@sushilshinde , not able to verify as the example challenge has not been migrated
notif.mov.zip

topcoder-platform/challenge-api#149