use rapids_cpm_* for gbench and gtest

cmake/dependencies.cmake

@@ -41,13 +41,11 @@ rapids_find_package(ZLIB
 
 if(MORPHEUS_BUILD_BENCHMARKS)
   # google benchmark
-  # - Expects package to pre-exist in the build environment
   # ================
-  rapids_find_package(benchmark REQUIRED
-    GLOBAL_TARGETS benchmark::benchmark
+  include(${rapids-cmake-dir}/cpm/gbench.cmake)
+  rapids_cpm_gbench(
     BUILD_EXPORT_SET ${PROJECT_NAME}-core-exports
     INSTALL_EXPORT_SET ${PROJECT_NAME}-core-exports
-    FIND_ARGS CONFIG
   )
 endif()
 
@@ -57,13 +55,11 @@ morpheus_utils_configure_glog()
 
 if(MORPHEUS_BUILD_TESTS)
   # google test
-  # - Expects package to pre-exist in the build environment
   # ===========
-  rapids_find_package(GTest REQUIRED
-    GLOBAL_TARGETS GTest::gtest GTest::gmock GTest::gtest_main GTest::gmock_main
+  include(${rapids-cmake-dir}/cpm/gtest.cmake)
+  rapids_cpm_gtest(
     BUILD_EXPORT_SET ${PROJECT_NAME}-core-exports
     INSTALL_EXPORT_SET ${PROJECT_NAME}-core-exports
-    FIND_ARGS CONFIG
   )
 endif()