Fixed regression with apiValidator search (openvinotoolkit#25252)

### Details:
- Regression after
openvinotoolkit#25069
- With `function` some vars are bounded to its scope, while they are
required for functions below

cmake/developer_package/api_validator/api_validator.cmake

@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: Apache-2.0
 #
 
-function(ov_search_api_validator)
+macro(ov_search_api_validator)
     if(NOT ENABLE_API_VALIDATOR)
         return()
     endif()
@@ -15,8 +15,6 @@ function(ov_search_api_validator)
             string(REPLACE "\\" "" WINDOWS_SDK_VERSION $ENV{WindowsSDKVersion})
             set(CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION ${WINDOWS_SDK_VERSION})
             message(STATUS "Use ${CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION} Windows SDK version")
-            # set to parent scope as well for later usage in '_ov_add_api_validator_post_build_step'
-            set(CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION ${WINDOWS_SDK_VERSION} PARENT_SCOPE)
         else()
             message(FATAL_ERROR "WindowsSDKVersion environment variable is not set,\
 can't find Windows SDK version. Try to use vcvarsall.bat script")
@@ -47,9 +45,12 @@ can't find Windows SDK version. Try to use vcvarsall.bat script")
             message(STATUS "Found apivalidator: ${ONECORE_API_VALIDATOR}")
         endif()
     endif()
-endfunction()
+endmacro()
+
 
-ov_search_api_validator()
+if(ENABLE_API_VALIDATOR)
+    ov_search_api_validator()
+endif()
 
 function(_ov_add_api_validator_post_build_step_recursive)
     cmake_parse_arguments(API_VALIDATOR "" "TARGET" "" ${ARGN})