Cleanup: Rename COMPOSITOR_REALTIME to GPU_COMPOSITOR

Pull Request: https://projects.blender.org/blender/blender/pulls/132118

CMakeLists.txt

@@ -837,7 +837,7 @@ option(WITH_GPU_DRAW_TESTS "\
 Enable GPU drawing related unit testing (draw manager)"
   OFF
 )
-option(WITH_COMPOSITOR_REALTIME_TESTS "Enable regression testing for realtime compositor" OFF)
+option(WITH_GPU_COMPOSITOR_TESTS "Enable regression testing for GPU compositor" OFF)
 if(UNIX AND NOT (APPLE OR HAIKU))
   option(WITH_UI_TESTS "\
 Enable user-interface tests using a headless display server. \

tests/python/CMakeLists.txt

@@ -893,7 +893,7 @@ else()
 
 endif()
 
-if(WITH_COMPOSITOR_REALTIME_TESTS)
+if(WITH_GPU_COMPOSITOR_TESTS)
   if(NOT OPENIMAGEIO_TOOL)
     message(WARNING "Disabling compositor tests because OIIO oiiotool does not exist")
   else()