[achievements] tests for recent_achievements on the UI frontend side

[bensim0305]

This PR ensures coverage of PR #1257 . This PR also caught a bug where the "recent_achievements" function was not being called even on the user's own profile, so made the small fix in the user_achievements view to include the recent achievements. This test covers that the user achievement attributes are populating correctly on the frontend.

[jiayuew1]

The test worked out great! I just have a minor question regarding the recent achievements not being called.
It seems that PR #1257 does include recent achievements in both the if pk block and the final context dictionary.
Could you help confirm if there's anything I might be missing?

[bensim0305]

It looked like the if block is for when the user is viewing another user's profile, which then calls the recent_achievements function. In the else statement, it doesn't call the recent_achievements for viewing one's own recent achievements in the first "if-else" block. I noticed this error when testing, and the "recent_achivements" was not popping up when viewing their own profile.

[jiayuew1]

Thank you for the explanation !