Fix RTOS_V2 cmsis_os2.h search path for newer STM32Cube packages

[Copilot]

FindCMSIS.cmake searches for RTOS files only in Middlewares/Third_Party/FreeRTOS/Source/CMSIS_${RTOS_COMP}. This works for RTOS (cmsis_os.h) but fails for RTOS_V2 (cmsis_os2.h), which lives in Drivers/CMSIS/RTOS2/ in newer STM32Cube packages (e.g., STM32CubeH5).

Changes

• Added Drivers/CMSIS/RTOS2/Include to header search paths for cmsis_os2.h
• Added Drivers/CMSIS/RTOS2/Template to source search paths for cmsis_os2.c
• Maintains backward compatibility by keeping original Middlewares path

find_path(CMSIS_${FAMILY}${CORE_U}_${RTOS_COMP}_PATH
    NAMES "cmsis_os${RTOS_COMP_VERSION}.h"
    PATHS
        "${STM32_CUBE_${FAMILY}_PATH}/Middlewares/Third_Party/FreeRTOS/Source/CMSIS_${RTOS_COMP}"
        "${STM32_CUBE_${FAMILY}_PATH}/Drivers/CMSIS/RTOS2/Include"
    NO_DEFAULT_PATH
)

Both RTOS and RTOS_V2 components now resolve correctly across all STM32Cube package versions.

Original prompt

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This section details on the original issue you should resolve

<issue_title>RTOS_V2's cmsis_os2.h is searched for incorrectly</issue_title>
<issue_description>Currently, FindCMSIS.cmake searches for it like so.

        find_path(CMSIS_${FAMILY}${CORE_U}_${RTOS_COMP}_PATH
            NAMES "cmsis_os${RTOS_COMP_VERSION}.h"
            PATHS "${STM32_CUBE_${FAMILY}_PATH}/Middlewares/Third_Party/FreeRTOS/Source/CMSIS_${RTOS_COMP}"
            NO_DEFAULT_PATH
        )

This code is correct for cmsis_os.h, but not for cmsis_os2.h. That file lives under ${STM32_CUBE_${FAMILY}_PATH}/Drivers/CMSIS/RTOS2/Include. That's at least true for STM32H5; see here.</issue_description>

Comments on the Issue (you are @copilot in this section)

@Hish15 Hello @tcbennun, is changing this path enough to make it work for you ? If it is, the fix on this repo is just to add the path like so : ```cmake find_path(CMSIS_${FAMILY}${CORE_U}_${RTOS_COMP}_PATH NAMES "cmsis_os${RTOS_COMP_VERSION}.h" PATHS "${STM32_CUBE_${FAMILY}_PATH}/Middlewares/Third_Party/FreeRTOS/Source/CMSIS_${RTOS_COMP}" "${STM32_CUBE_${FAMILY}_PATH}/Drivers/CMSIS/RTOS2/Include" NO_DEFAULT_PATH ) ```

• Fixes RTOS_V2's cmsis_os2.h is searched for incorrectly #356

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