fix(challenge): recitfiy challenge loading through url (@albindavidc)

[albindavidc]

Description

Rectified the error of loading the challenges through url.

1. delayed the loading of the challenges from url.
2. updated the notifications. (as it was notifying both in controller and in the handler)

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Closes #7704

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[fehmer]

hi @albindavidc , pr looks good, few comments to fix