Challenge Listing - Filter by tags/skills

[luizrrodrigues]

Describe the bug
With updated search feature in challenge-api, tags not searchable via query anymore, need use tags[] field.

To Reproduce
Steps to reproduce the behavior:

1. Go to challenge listing page;
2. Click on any tag in challenge list;
3. Tag will be add to query search;
4. Only challenges with this tag in body will be returned.

Expected behavior
Need be able by tags

Screenshots

Additional context
I think we need to implement tags/skills field to filters, like we have in Earn app:

[luizrrodrigues]

@SathyaJayabal @Oanh-and-only-Oanh

This is issue about failing Automated Smoke Testing :
[TC-020] should verify that when user selects a challenge "tag", only challenges under the selected tag are shown