[backend] Fix wrong count for pagination

[RomuDeuxfois]

Proposed changes

• Add distinct on pagination to avoir duplicate result and have a good counting

Here, the result and the count is not aligned

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 32.55%. Comparing base (7142c8b) to head (a9e7456).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1529   +/-   ##
=========================================
  Coverage     32.55%   32.55%           
  Complexity     1464     1464           
=========================================
  Files           534      534           
  Lines         13766    13766           
  Branches        824      824           
=========================================
  Hits           4482     4482           
  Misses         9075     9075           
  Partials        209      209           

Flag	Coverage Δ
	32.55% <ø> (ø)

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