REFACTOR: FilterSolutions_class_refacoring

[ramin4667]

Description

This PR removes the unused FilterSolutions class from design types.

Issue linked

NA

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.97%. Comparing base (958b311) to head (ee65620).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5917      +/-   ##
==========================================
- Coverage   84.98%   84.97%   -0.01%     
==========================================
  Files         162      162              
  Lines       62343    62339       -4     
==========================================
- Hits        52980    52973       -7     
- Misses       9363     9366       +3     

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