KF-27 Fix assert in ~DoubleLinkedListEntry

[belyshevdenis]

No description provided.

[Copilot]

Pull Request Overview

This PR fixes an assertion error in the DoubleLinkedListEntry destructor by addressing two key issues: ensuring proper cleanup during move assignment and correcting the namespace scope for the IsListEmpty function.

• Adds a clear() call in the move assignment operator to properly clean up existing list elements
• Changes IsListEmpty(this) to ::IsListEmpty(this) to use the global scope function instead of potentially ambiguous local scope

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
test/DoubleLinkedListTest.cpp	Comprehensive test suite for DoubleLinkedList functionality including all list operations, iterators, and edge cases
test/CMakeLists.txt	Adds the new test file to the build configuration
include/kf/DoubleLinkedListEntry.h	Fixes namespace scope for IsListEmpty function call
include/kf/DoubleLinkedList.h	Adds clear() call in move assignment operator to prevent destructor assertion

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