Remove the riff-test-util from the packaging #739

Job	Run time
Build macOS (x86_64)	33m 29s
Windows MSVC 2019 (x86)	23m 17s
Build macOS (arm64)	34m 18s
Windows MSVC 2019 (x86_64)	22m 21s
Ubuntu 20.04 AppImage (x86_64)	26m 3s
Windows MSVC 2022 (x86)	23m 43s
Ubuntu 20.04 AppImage (x86_64, gcc 11)	23m 11s
Windows MSVC 2022 (x86_64)	21m 14s
Ubuntu 22.04 AppImage (x86_64)	23m 7s
Source Tarball	1m 54s
Package macOS (x86_64, arm64, universal)	5m 33s
	3h 58m 10s

Provide feedback