🐛 [BUG] Fix flaky tests (refs #4070)

[Chatewgne]

Description

Related Issue

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 (e2359b7) to head (216f26c).
Report is 5 commits behind head on move_routing_to_backend.

Additional details and impacted files

@@                   Coverage Diff                    @@
##           move_routing_to_backend    #4451   +/-   ##
========================================================
  Coverage                    98.46%   98.46%           
========================================================
  Files                          269      269           
  Lines                        21392    21392           
========================================================
  Hits                         21064    21064           
  Misses                         328      328           

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[cypress]

Geotrek-admin    Run #10855

Run Properties:   Passed #10855  •  426438e427 ℹ️: Merge 216f26ce82ed3f67fb4d577f77832d8b5c3e4e82 into e2359b7682c00b119a28d4e3c6c9...

Project	Geotrek-admin
Branch Review	refs/pull/4451/merge
Run status	Passed #10855
Run duration	02m 04s
Commit	426438e427 ℹ️: Merge 216f26ce82ed3f67fb4d577f77832d8b5c3e4e82 into e2359b7682c00b119a28d4e3c6c9...
Committer	Célia
View all properties for this run ↗︎

---

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

[submarcos]

use proper django extension

https://docs.djangoproject.com/en/5.1/ref/contrib/postgres/operations/#createextension