unit test: move unit-test_app test_utils_task_delete API to be a utils API (unity_utils_task_delete) in unity component

components/unity/include/unity_test_utils.h

@@ -0,0 +1,26 @@
+/*
+ * SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Delete task ensuring dynamic memory (for stack, tcb etc.) gets freed up immediately
+ *
+ * @param[in] thandle    Handle of task to be deleted (should not be NULL or self handle)
+ */
+void unity_utils_task_delete(TaskHandle_t thandle);
+
+#ifdef __cplusplus
+}
+#endif