Fix UBSan signed integer overflow in test busy-wait loops

[Krilliac]

The busy-wait pattern volatile int x = 0; for (int i = 0; i < N; ++i) x += i overflows signed int when N=100000 (sum ~5 billion). Changed all test busy-loop variables to unsigned int across TestDebugUtilities, TestProfiler, and TestChromeTracing to eliminate UBSan runtime errors.

https://claude.ai/code/session_013pbpQmtyuFCcGPZ7ZBGxPw

[github-actions]

Code Coverage (GCC + lcov)

Utils/JsonUtils.h                         |    -      0|    -     0|    -      0
Utils/LocalFileCache.h                    |12.7%    157| 0.0%    20|    -      0
Utils/Logger.cpp                          |21.8%    133| 0.0%    17|    -      0
Utils/Logger.h                            |18.2%    121| 0.0%    20|    -      0
Utils/MathUtils.cpp                       |    -      0|    -     0|    -      0
Utils/MemoryDebugger.h                    |13.3%    150| 0.0%    20|    -      0
Utils/MemoryMonitor.cpp                   | 9.6%    229| 0.0%    19|    -      0
Utils/MemoryMonitor.h                     |85.7%     14| 0.0%    12|    -      0
Utils/OpaqueHandle.h                      | 209%     11| 0.0%    15|    -      0
Utils/Profiler.cpp                        |14.2%    113| 0.0%    15|    -      0
Utils/Profiler.h                          |36.4%     33| 0.0%    12|    -      0
Utils/RandomEngine.h                      |29.3%     41| 0.0%    12|    -      0
Utils/Result.h                            | 100%     29| 0.0%    28|    -      0
Utils/RingBuffer.h                        | 108%     59| 0.0%    64|    -      0
Utils/ScopeGuard.h                        | 142%     36| 0.0%    51|    -      0
Utils/ScopedTimer.h                       |25.0%     12| 0.0%     3|    -      0
Utils/Serializer.h                        | 100%     48| 0.0%    42|    -      0
Utils/SparkConsole.cpp                    | 125%     32| 0.0%     6|    -      0
Utils/SparkConsole.h                      | 100%      2| 0.0%     2|    -      0
Utils/SparkError.h                        |10.9%     55| 0.0%     6|    -      0
Utils/SplinePath.h                        |    -      0|    -     0|    -      0
Utils/StackTrace.h                        |11.0%     73| 0.0%     8|    -      0
Utils/StateMachine.h                      |54.0%     63| 0.0%    32|    -      0
Utils/StringUtils.h                       |18.8%    112| 0.0%    21|    -      0
Utils/ThreadDebugger.h                    |12.8%    148| 0.0%    19|    -      0
Utils/ThreadSafeQueue.h                   |27.5%     40| 0.0%    11|    -      0
Utils/UUID.h                              |43.2%     37| 0.0%    16|    -      0
Utils/Validate.h                          |    -      0|    -     0|    -      0

[/home/runner/work/SparkEngine/SparkEngine/SparkSDK/Include/Spark/]
IEngineContext.h                          |6700%      1| 0.0%     1|    -      0
Version.h                                 |    -      0|    -     0|    -      0
================================================================================
                                    Total:|35.2%  11992| 0.0%  2422|    -      0