[IMPR] Add contractor to intervention model (#3820)

[juggler31]

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

[cypress]

Passing run #8022 ↗︎

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Details:

Merge e23f1e9 into 566db8c...
Project: Geotrek-admin	Commit: fd0a91a7b1 ℹ️
Status: Passed	Duration: 02:10 💡
Started: Feb 19, 2024 3:14 PM	Ended: Feb 19, 2024 3:16 PM

Review all test suite changes for PR #3928 ↗︎

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (566db8c) 98.34% compared to head (e23f1e9) 98.35%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3928   +/-   ##
=======================================
  Coverage   98.34%   98.35%           
=======================================
  Files         294      294           
  Lines       22274    22286   +12     
=======================================
+ Hits        21906    21919   +13     
+ Misses        368      367    -1     

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