Compositor: Disable anisotropic filtering tests on GPU

This patch disables compositor tests that rely on anisotropic filtering
for GPU testing. This is done until we make sure they pass universally
by not relying on hardware filtering.

Test files that rely on anisotropic filtering were moved to their own
tests to be able to disable them for GPU only.

tests/python/CMakeLists.txt

@@ -879,7 +879,7 @@ else()
   )
 
   if(WITH_LIBMV)
-    list(APPEND compositor_tests distort matte)
+    list(APPEND compositor_tests distort matte anisotropic_filtering)
   endif()
 
   foreach(comp_test ${compositor_tests})