Fix inline relations not being selected automatically when populated

[Convly]

What does it do?

When dealing with relations not using join tables, it appears that they're not automatically selected when populated.

Why is it needed?

Allow populating inline relations without having to select all the fields.

How to test it?

• Use a content type having creators fields (createdBy, updatedBy)
• Create some entities from the content manager (so that createdBy and updatedBy are filled)
• Make a query to this content type

await strapi.entityService.findMany("<uid>", {
  fields: ["id"],
  populate: {
    createdBy: {
      fields: ["id"]
    }
  }
});

• You should have both the id of your entity and a createdBy: { id: X } property.

[codecov]

Codecov Report

Base: 58.76% // Head: 58.76% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (b4f4b49) compared to base (65feb97).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14695      +/-   ##
==========================================
- Coverage   58.76%   58.76%   -0.01%     
==========================================
  Files        1322     1322              
  Lines       32040    32042       +2     
  Branches     5981     5987       +6     
==========================================
  Hits        18829    18829              
- Misses      11350    11351       +1     
- Partials     1861     1862       +1     

Flag	Coverage Δ
front	62.47% <ø> (ø)
unit	50.20% <0.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ckages/core/database/lib/query/helpers/populate.js	2.95% <0.00%> (-0.03%)	⬇️

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[alexandrebodin]

LGTM