Fixed load of nested relationships

[binaryk]

Fixed

• fixing load of nested relationships Does not re-give relationships in query type a.b.c #576
• this might introduce a performance problem if data not cached, will continue to monitor this

[what-the-diff]

PR Summary

• Introduction of conditional logic for handling data
  The system's ability to process related data has been enhanced in the RelatedCollection.php file. This change aids in more flexible handling of data which significantly improves the software's adaptability to various use case scenarios.

• Enhancements to the RelatedDto.php
  The RelatedDto.php file now includes a new public property, $query, which broadens scope for querying the system. Also, a new method isDeepRelation has been introduced to probe deeply nested relations in the data.

• Refinement of code commments
  The comments in RestResponse.php, ValidatingTrait.php, CompanyPolicy.php, and MailTracking.php files have been reviewed and deemed unnecessary for the functioning of the code, hence we have tidied up the code by removing these comments.

• Temporary disablement of a method
  In Repository.php a certain method has been temporarily switched off by commenting it out. This suggests a potential review or replacement of this part of the code in near future.

• Streamlining mail tracking methods
  The methods dealing with email handling in the MailTracking.php file have been streamlined. Redundant parameters in the assertEmailEquals, assertEmailContains, assertEmailSubject, assertEmailTo, assertEmailFrom, and getEmail methods have been removed. This edit boosts the efficiency in the email handling process and may make debugging easier.

• Improved testing
  A new testing method titled test_can_load_deep_relationships has been incorporated in the IndexRelatedFeatureTest.php file. This ensures better and robust testing capabilities particularly for deep relational data in our software system.