[backend] use patchAttribute for ref relation Replace (#6295)

[marieflorescontact]

Proposed changes

• use patchAttribute instead of delete then create for ref relationship REPLACE

Related issues

• issue/6295

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.65%. Comparing base (12d021d) to head (e5006e6).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6396   +/-   ##
=======================================
  Coverage   67.65%   67.65%           
=======================================
  Files         532      532           
  Lines       64997    64972   -25     
  Branches     5434     5434           
=======================================
- Hits        43975    43960   -15     
+ Misses      21022    21012   -10     

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