Internal improvements

[mshima]

See each commit

Related to #26471

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• All continuous integration tests are green
• Tests are added where necessary
• The JDL part is updated if necessary
• jhipster-online is updated if necessary
• Documentation is added/updated where necessary
• Coding Rules & Commit Guidelines as per our CONTRIBUTING.md document are followed

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[mshima]

@mraible it’s not a blocking for v8.6.0.
So I will let you decide if you want to include (don’t need to delay v8.6.0 due to merging process).