Replace our firstIfSingle extension with singleOrNull from the Kotlin library

[bmarty]

What the title say. It should have no impact.

[github-actions]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.31%. Comparing base (8ff31b5) to head (2e53238).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #4184   +/-   ##
========================================
  Coverage    83.31%   83.31%           
========================================
  Files         1881     1881           
  Lines        49101    49101           
  Branches      5769     5769           
========================================
  Hits         40910    40910           
  Misses        6116     6116           
  Partials      2075     2075           

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