🐛 [BUG] Prevent objects from being returned several times in APIv2 by filtering on ManyToMany (refs #4448)

[Chatewgne]

Description

Related Issue

#4448

Checklist

• I have followed the guidelines in our Contributing document
• My code respects the Definition of done available in the Development section of the documentation
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes
• I added an entry in the changelog file
• My commits are all using prefix convention (emoji + tag name) and references associated issues
• I added a label to the PR corresponding to the perimeter of my contribution
• The title of my PR mentionned the issue associated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.46%. Comparing base (7bf9436) to head (6a29e0e).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4449   +/-   ##
=======================================
  Coverage   98.46%   98.46%           
=======================================
  Files         268      268           
  Lines       21362    21362           
=======================================
  Hits        21035    21035           
  Misses        327      327           

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[cypress]

Geotrek-admin    Run #10782

Run Properties:   Passed #10782  •  ecee23fd89 ℹ️: Merge 6a29e0e7980cbd42739b4cc53c4f9dc5c1e835ac into 8af572ee2f5e69c268837036bca4...

Project	Geotrek-admin
Branch Review	refs/pull/4449/merge
Run status	Passed #10782
Run duration	02m 03s
Commit	ecee23fd89 ℹ️: Merge 6a29e0e7980cbd42739b4cc53c4f9dc5c1e835ac into 8af572ee2f5e69c268837036bca4...
Committer	Célia
View all properties for this run ↗︎

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Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	22
View all changes introduced in this branch ↗︎