Improved code coverage

[marcoSanti]

This pull request introduces unit tests for the StorageManager and ClientManager classes and refactors parts of their implementation to improve testability and coverage reporting.

Changes

• Refactor ClientManager for improved gcovr compatibility

  • Modify ClientManager::ClientDataBuffers to store objects instead of pointers. This allows gcovr to correctly detect destructor calls for member attributes.
  • Introduce a dedicated constructor for ClientDataBuffers to simplify object creation and ensure proper coverage reporting. Previously, move operations were interpreted by gcovr as partially covered code.

• Add unit tests

  • Add comprehensive unit tests for the StorageManager class.
  • Add comprehensive unit tests for the ClientManager class.

• Improve StorageManager testability

  • Remove the dependency on the global client_manager variable by passing a reference through the StorageManager constructor.
  • This enables unit tests to compile and run without requiring a globally defined client_manager.

• Bug fix

  • Fix a minor issue in StorageManager::getPaths() where empty paths were previously added to the returned vector.

• Build system update

  • Move the CAPIO-CL dependency from capio/server/CMakeLists.txt to the top-level project CMakeLists.txt, allowing both the server components and the unit tests to compile successfully.

[codecov]

Codecov Report

❌ Patch coverage is 68.80000% with 39 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.50%. Comparing base (79e5b06) to head (7df1a47).

Files with missing lines	Patch %	Lines
capio/tests/unit/server/src/storage_manager.hpp	66.12%	0 Missing and 21 partials ⚠️
capio/tests/unit/server/src/client_manager.hpp	67.85%	0 Missing and 9 partials ⚠️
capio/tests/unit/server/src/main.cpp	60.86%	0 Missing and 9 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #208      +/-   ##
==========================================
+ Coverage   56.14%   58.50%   +2.35%     
==========================================
  Files          71       75       +4     
  Lines        3482     3639     +157     
  Branches     2165     2271     +106     
==========================================
+ Hits         1955     2129     +174     
+ Misses        575      548      -27     
- Partials      952      962      +10     

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