[5.5] fix for HasManyThrough returning incorrect results with chunk() (#21774)

[AmmarRahman]

fixes issues with chunk() and each() behaviour on HasManyThrough. Root cause of the issue is, unlike the get() method that is handled on the relationship, these methods are handled through Eloquent Query Builder without updating of the columns that should be selected.

[taylorotwell]

I am closing this pull request because it lacks sufficient explanation, tests, or both. It is difficult for us to merge pull requests without these things because the change may introduce breaking changes to the framework.

Feel free to re-submit your change with a thorough explanation of the feature and tests - integration tests are preferred over unit tests. Please include it's benefit to end users; the reasons it does not break any existing features; how it makes building web applications easier, etc.

Thanks!

[AmmarRahman]

Hi Tailor,
The issue is thoroughly explained in #21774. HasManyThrough chunk() method does not produce the expected results. I will try to expand on the seeder and write tests for chunk on HasManyThrough next week.

Thanks for the amazing framework