[backend] Improv performance on articles

[RomuDeuxfois]

#898

[codecov]

Codecov Report

Attention: Patch coverage is 72.50000% with 22 lines in your changes missing coverage. Please review.

Project coverage is 26.51%. Comparing base (a059c30) to head (b651bd9).
Report is 1 commits behind head on master.

Files	Patch %	Lines
...in/java/io/openbas/rest/channel/ChannelHelper.java	70.37%	8 Missing ⚠️
...va/io/openbas/rest/channel/ExerciseArticleApi.java	11.11%	8 Missing ⚠️
.../main/java/io/openbas/rest/channel/ChannelApi.java	33.33%	4 Missing ⚠️
.../io/openbas/rest/channel/output/ArticleOutput.java	93.10%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1064      +/-   ##
============================================
+ Coverage     26.17%   26.51%   +0.34%     
- Complexity     1011     1028      +17     
============================================
  Files           451      455       +4     
  Lines         10568    10619      +51     
  Branches        513      513              
============================================
+ Hits           2766     2816      +50     
+ Misses         7739     7738       -1     
- Partials         63       65       +2     

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[Christian-DONGMO]

I think you should use jakarta.validation.constraints.NotNull instead of org.jetbrains.annotations.NotNull

[Christian-DONGMO]

I just have a comment about annotation. Otherwise, everything else looks good to me