[BugFix] Fetch public leaderboard when user is not authenticated

[Ram81]

Description

This PR fixes bug introduced in this PR -

• Move to GET requests for multi metric leaderboard API calls.

[codecov-commenter]

Codecov Report

Merging #3590 (55bd1a3) into master (96968d6) will decrease coverage by 1.40%.
The diff coverage is 33.39%.

@@            Coverage Diff             @@
##           master    #3590      +/-   ##
==========================================
- Coverage   72.93%   71.53%   -1.41%     
==========================================
  Files          83       20      -63     
  Lines        5368     3235    -2133     
==========================================
- Hits         3915     2314    -1601     
+ Misses       1453      921     -532     

Impacted Files	Coverage Δ
frontend/src/js/controllers/authCtrl.js	53.91% <6.38%> (-12.95%)	⬇️
frontend/src/js/controllers/profileCtrl.js	79.76% <20.00%> (-13.10%)	⬇️
frontend/src/js/controllers/permissionCtrl.js	36.36% <22.22%> (-63.64%)	⬇️
frontend/src/js/controllers/challengeCtrl.js	63.54% <31.97%> (-10.15%)	⬇️
frontend/src/js/controllers/updateProfileCtrl.js	82.55% <44.44%> (-10.30%)	⬇️
frontend/src/js/controllers/challengeListCtrl.js	95.74% <50.00%> (+1.06%)	⬆️
...ntend/src/js/controllers/challengeHostTeamsCtrl.js	70.50% <66.66%> (-1.18%)	⬇️
frontend/src/js/controllers/teamsCtrl.js	71.17% <75.00%> (ø)
frontend/src/js/controllers/ChallengeInviteCtrl.js	100.00% <100.00%> (ø)
frontend/src/js/controllers/SubmissionFilesCtrl.js	95.45% <100.00%> (ø)
... and 30 more

Impacted Files	Coverage Δ
frontend/src/js/controllers/authCtrl.js	53.91% <6.38%> (-12.95%)	⬇️
frontend/src/js/controllers/profileCtrl.js	79.76% <20.00%> (-13.10%)	⬇️
frontend/src/js/controllers/permissionCtrl.js	36.36% <22.22%> (-63.64%)	⬇️
frontend/src/js/controllers/challengeCtrl.js	63.54% <31.97%> (-10.15%)	⬇️
frontend/src/js/controllers/updateProfileCtrl.js	82.55% <44.44%> (-10.30%)	⬇️
frontend/src/js/controllers/challengeListCtrl.js	95.74% <50.00%> (+1.06%)	⬆️
...ntend/src/js/controllers/challengeHostTeamsCtrl.js	70.50% <66.66%> (-1.18%)	⬇️
frontend/src/js/controllers/teamsCtrl.js	71.17% <75.00%> (ø)
frontend/src/js/controllers/ChallengeInviteCtrl.js	100.00% <100.00%> (ø)
frontend/src/js/controllers/SubmissionFilesCtrl.js	95.45% <100.00%> (ø)
... and 30 more

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