[Infrastructure] Remove obsolete macOS build from clean-test (#18093)

Author: vkucera

.github/workflows/clean-test.yml

@@ -24,11 +24,6 @@ name: Clean PR checks
         type: boolean
         default: true
 
-      'check_build/O2Physics/o2/macOS':
-        description: build/O2Physics/o2/macOS
-        type: boolean
-        default: true
-
       'check_build/O2Physics/o2':
         description: build/O2Physics/o2
         type: boolean