CMake: use bf_io_ prefix for IO tests

This simplifies running built-in IO tests with:

  ctest -R bf_io_

Also use "bf_io_" prefix for the libraries since it was already used
by some and it's a useful hint the libraries are used for IO.

tests/python/CMakeLists.txt

@@ -878,7 +878,7 @@ if(WITH_ALEMBIC)
   get_filename_component(ALEMBIC_ROOT_DIR ${real_include_dir} DIRECTORY)
 
   add_python_test(
-    alembic_export_tests
+    bf_io_alembic_export_tests
     ${CMAKE_CURRENT_LIST_DIR}/alembic_export_tests.py
     --blender "${TEST_BLENDER_EXE}"
     --testdir "${TEST_SRC_DIR}/alembic"
@@ -895,13 +895,13 @@ endif()
 
 if(WITH_USD)
   add_blender_test(
-          usd_export_test
+          bf_io_usd_export_test
           --python ${CMAKE_CURRENT_LIST_DIR}/bl_usd_export_test.py
           --
           --testdir "${TEST_SRC_DIR}/usd"
   )
   add_blender_test(
-    usd_import_test
+    bf_io_usd_import_test
     --python ${CMAKE_CURRENT_LIST_DIR}/bl_usd_import_test.py
     --
     --testdir "${TEST_SRC_DIR}/usd"

tests/python/collada/CMakeLists.txt

@@ -39,7 +39,7 @@ endif()
 # GENERAL PYTHON CORRECTNESS TESTS
 macro(COLLADA_TEST module test_name blend_file)
   add_test(
-    NAME collada_${module}_${test_name}
+    NAME bf_io_collada_${module}_${test_name}
     COMMAND "$<TARGET_FILE:blender>" ${TEST_BLENDER_EXE_PARAMS} ${TEST_SRC_DIR}/collada/${module}/${blend_file}
     --python ${CMAKE_CURRENT_LIST_DIR}/${module}/test_${module}_${test_name}.py --
     --testdir ${TEST_SRC_DIR}/collada/${module}