fix(MyCustomBuildProcessor): スクリプトを削除

以下のようなエラーが発生したため
Error:  FATAL UNHANDLED EXCEPTION: System.AggregateException: One or more errors occurred. ---> System.ComponentModel.Win32Exception: ApplicationName='/usr/local/Cellar/[email protected]/3.9.4/Frameworks/Python.framework/Versions/3.9/bin/python3.9', CommandLine='-E "/opt/unity/Editor/Data/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/em++" -Wno-unused-value -Wno-invalid-offsetof -nostdinc -fno-strict-overflow -Wno-null-conversion -std=c++11 -O3 -Oz -DIL2CPP_EXCEPTION_DISABLED=1  -DNET_4_0 -DUNITY_AOT -DIL2CPP_MONO_DEBUGGER_DISABLED -DGC_NOT_DLL -DRUNTIME_IL2CPP -DNDEBUG -I"/opt/unity/Editor/Data/il2cpp/libil2cpp" -I"/opt/unity/Editor/Data/il2cpp/libil2cpp" -I"/opt/unity/Editor/Data/il2cpp/external/bdwgc/include" -I"/opt/unity/Editor/Data/il2cpp/external/xxHash" -I"/github/workspace/Temp/StagingArea/Data/il2cppOutput" "/github/workspace/Temp/StagingArea/Data/il2cppOutput/Il2CppCompilerCalculateTypeValues.cpp" -o "/github/workspace/Library/il2cpp_cache/BC6541B2117AC4692844E65607576E98.o"', CurrentDirectory='', Na