[FIX] Fix memory leaks in BodyEntitySyncTest

[Miou-zora]

Bug Description

Memory leak(s) have been detected in the BodyEntitySyncTest test suite. These leaks must be identified, root-caused, and fixed to ensure the test passes cleanly under memory checking tools (e.g. Valgrind, AddressSanitizer).

Steps to Reproduce

1. Build the project with memory checking enabled (e.g. AddressSanitizer or Valgrind).
2. Run the BodyEntitySyncTest test suite.
3. Observe memory leak reports in the output.

Expected Behavior

BodyEntitySyncTest runs to completion with no memory leaks reported.

Actual Behavior

One or more memory leaks are reported when running BodyEntitySyncTest under a memory checker.

Environment

• OS: [e.g. Ubuntu 22.04]
• Compiler: [e.g. Clang 15]
• Vulkan SDK Version: [e.g. 1.3.268.0]
• Engine² Version/Commit: [current main]

Additional Context

This fix is a prerequisite for making the memory leak check mandatory in CI.

Related Issues

• [FIX] Fix memory leaks in BindGroupTest #561 (BindGroupTest memory leak fix)
• [FIX] Fix memory leaks in BodyEntitySyncTest #562 (RenderPassTest memory leak fix)
• [FIX] Fix memory leaks in RenderPassTest #563 (GBufferTest memory leak fix)
• [FIX] Fix memory leaks in GBufferTest #564 (CharacterControllerTest memory leak fix)