KF-33 add tests for ThreadPool

[Kellesi]

Task: https://jira.dev.local/jira/browse/KF-33

[Copilot]

Pull Request Overview

This PR adds comprehensive test coverage for the kf::ThreadPool class to address ticket KF-33. The tests verify core ThreadPool functionality including thread creation, execution, cleanup, and move semantics.

• Adds test scenarios for normal operation, boundary conditions, and move semantics
• Includes precompiled header updates with C++ runtime helper functions for kernel-mode testing
• Fixes uninitialized array issue in ThreadPool header

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
test/ThreadPoolTest.cpp	New comprehensive test suite covering ThreadPool functionality with various scenarios
test/pch.h	Adds C++ runtime helper functions needed for kernel-mode testing environment
test/CMakeLists.txt	Includes the new ThreadPoolTest.cpp in the build configuration
include/kf/ThreadPool.h	Initializes m_threads array to prevent undefined behavior

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[Copilot]

The magic number -10'000 should be documented or replaced with a named constant. This appears to be a 1ms delay in 100ns units, but this is not immediately clear.

Suggested change

	};
	// 1 millisecond delay in 100ns units (negative for relative time)
	constexpr LONGLONG ONE_MILLISECOND_DELAY_100NS_UNITS = -10'000;
	constexpr auto fn = [](void* context) {
	LARGE_INTEGER interval;
	interval.QuadPart = ONE_MILLISECOND_DELAY_100NS_UNITS;
	KeDelayExecutionThread(KernelMode, FALSE, &interval);
	auto p = static_cast<LONG*>(context);
	InterlockedIncrement(p);
	};

[Copilot]

The magic number 64 should be replaced with a reference to kMaxCount to make the test more maintainable. If kMaxCount changes, this test would fail unexpectedly.

Suggested change

	REQUIRE(value == 64);
	REQUIRE(value == kf::ThreadPool::kMaxCount);