fix: Add hack to remove duplicate sessions in user sessions API

[iamareebjamal]

Fixes fossasia/open-event-frontend#3703
Fixes #6763

[codecov]

Codecov Report

Merging #7152 into development will decrease coverage by 0.06%.
The diff coverage is 16.66%.

@@               Coverage Diff               @@
##           development    #7152      +/-   ##
===============================================
- Coverage        62.79%   62.73%   -0.07%     
===============================================
  Files              262      262              
  Lines            13028    13046      +18     
===============================================
+ Hits              8181     8184       +3     
- Misses            4847     4862      +15     

Impacted Files	Coverage Δ
app/api/sessions.py	47.22% <16.66%> (-4.37%)	⬇️

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