Remove BOOST_SOURCE=BUNDLED to use vcpkg's dynamic link to boost

Since we need to use link to boost dynamically, we need to remove the bundled boost library flag.

Add debug messages.

Author: alinaliBQ

.github/workflows/cpp_windows.yml

@@ -65,7 +65,6 @@ jobs:
       ARROW_WITH_SNAPPY: ON
       ARROW_WITH_ZLIB: ON
       ARROW_WITH_ZSTD: ON
-      BOOST_SOURCE: BUNDLED
       CMAKE_CXX_STANDARD: "17"
       CMAKE_GENERATOR: Ninja
       CMAKE_INSTALL_PREFIX: /usr

cpp/cmake_modules/ThirdpartyToolchain.cmake

@@ -1269,14 +1269,19 @@ else()
 endif()
 
 if(ARROW_USE_BOOST)
+  message(status "-AL- ARROW_BOOST_USE_SHARED: ${ARROW_BOOST_USE_SHARED}")
   if(ARROW_BOOST_USE_SHARED)
     # Find shared Boost libraries.
     set(Boost_USE_STATIC_LIBS OFF)
     set(BUILD_SHARED_LIBS_KEEP ${BUILD_SHARED_LIBS})
     set(BUILD_SHARED_LIBS ON)
+    message(status "-AL- ARROW_BOOST_USE_SHARED TEMP - Boost_USE_STATIC_LIBS: ${Boost_USE_STATIC_LIBS}"
+    )
   else()
     # Find static boost headers and libs
     set(Boost_USE_STATIC_LIBS ON)
+    message(status "-AL- NOT ARROW_BOOST_USE_SHARED TEMP - Boost_USE_STATIC_LIBS: ${Boost_USE_STATIC_LIBS}"
+    )
   endif()
   if(ARROW_BOOST_REQUIRE_LIBRARY)
     set(ARROW_BOOST_COMPONENTS filesystem)