Add Implicit @pool for Each Unit Test Invocation (#2654)

* Add Implicit `@pool` for Each Unit Test Invocation

test/unit/stdlib/runtime_test.c3

@@ -0,0 +1,26 @@
+module runtime_test_tests @test;
+
+import std::core::runtime @public;
+import std::core::mem::allocator @public;
+import std::math::random;
+
+
+fn void tmem_shouldnt_leak_if_no_pool()
+{
+	for (usz i = 0; i < 256; i++)
+	{
+		char[] my_arr = mem::talloc_array(char, 1024);
+        my_arr[..] = (char[*]){ [0..1023] = 0xA5 }[..];
+	}
+}
+
+fn void ensure_leak_check_works()
+{
+	if (!(runtime::test_context.check_leaks)) return;
+
+	char[] my_arr = mem::alloc_array(char, 1024);
+	test::@check(((TrackingAllocator*)allocator::thread_allocator).has_leaks());
+
+	mem::free(my_arr);
+	test::@check(!((TrackingAllocator*)allocator::thread_allocator).has_leaks());
+}