fix: fixing search to use join instead of subquery

[binaryk]

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[what-the-diff]

PR Summary

• Improvement in Querying Process
  Updated the 'filter' method that helps remove unnecessary database operations, by intelligently checking if a 'join' operation is required before performing it. This makes our system's data querying more efficient.

• Application of Search Conditions
  The searching method has been replaced to optimize searching through related data. It now provides an option for case-sensitive searches, making the results more precise.

• Removal of Redundant Filtering Logic
  In 'RepositorySearchService.php', ineffective and unused filtering logic has been removed. While the functionality remains the same, this change makes the codebase cleaner and easier to manage.

• Enhanced Code Clarity and Efficiency
  The overall restructuring of the code not only promotes better understanding for developers but also cuts down unnecessary database operations. Hence, this results in improved performance and code maintainability.