Fix CMP0173 policy warning with cmake 3.31 (#110522)

In some places, where we use `find_library(FOUNDATION`, we don't `include(CMakeFindFrameworks)` while in other places we do.  These look like added "just in case". CMake 3.31 has deprecated `include(CMakeFindFrameworks)`:

Author: am11

src/coreclr/dlls/mscoree/coreclr/CMakeLists.txt

@@ -186,7 +186,6 @@ if(FEATURE_MERGE_JIT_AND_ENGINE)
 endif(FEATURE_MERGE_JIT_AND_ENGINE)
 
 if (CLR_CMAKE_TARGET_OSX)
-    include(CMakeFindFrameworks)
     find_library(FOUNDATION Foundation REQUIRED)
 endif()
 

src/native/libs/System.Globalization.Native/CMakeLists.txt

@@ -140,7 +140,6 @@ include_directories("../Common")
 
 if (GEN_SHARED_LIB)
     if (CLR_CMAKE_TARGET_APPLE)
-        include(CMakeFindFrameworks)
         find_library(FOUNDATION Foundation REQUIRED)
     endif()
 

src/native/libs/System.Native/extra_libs.cmake

@@ -13,7 +13,6 @@ macro(append_extra_system_libs NativeLibsExtra)
     endif ()
 
     if (CLR_CMAKE_TARGET_APPLE)
-        include(CMakeFindFrameworks)
         find_library(FOUNDATION Foundation REQUIRED)
         list(APPEND ${NativeLibsExtra} ${FOUNDATION})
     endif ()

src/tests/Interop/ObjectiveC/AutoReleaseTest/CMakeLists.txt

@@ -15,7 +15,6 @@ set(SOURCES
 
 set_source_files_properties(autorelease.m PROPERTIES COMPILE_FLAGS -fno-objc-arc)
 
-include(CMakeFindFrameworks)
 find_library(FOUNDATION Foundation REQUIRED)
 
 add_library(ObjectiveC SHARED ${SOURCES})