Sound effect to confirm text is copied to clipboard
I only know of one Clipboard manager for macOS that has the ability to play a sound when you copy/paste: Copy 'Em for Mac ($10USD).
To be candid, when I was evaluating clipboard management tools, I didn't see many with this feature because it seems like it would get annoying very quickly. Besides my extensive use of the clipboard which required me to look for a management tool (I settled on FlyCut†), having a sound every time something was sent to my clipboard - normally selecting and copy/cut, using the CLI tool pbcopy
or from my password management or text expansion/replacement tools - I would imagine that my computer would sound like a telegraph operator keying out some Morse code. You might be better served with something that gives you visual feedback rather than audible.
†Flycut is an open source tool that is "free" though the developers do accept donations and I highly encourage folks to send them some compensation if you find their app/utility of use to you. I prefer to support this type development effort because their code is open for all to see.