Install dnf copr plugin if not present (i.e. docker containers). (#24308)

* Install `dnf copr` plugin if not present (i.e. docker containers).

* Don't need to skip prompt when invoking help.

util/install/fedora.sh

@@ -5,6 +5,7 @@ _qmk_install() {
 
     . /etc/os-release
     if [ "$VERSION_ID" -ge "39" ]; then
+        sudo dnf copr -h >/dev/null 2>&1 || sudo dnf $SKIP_PROMPT install dnf-plugins-core
         sudo dnf $SKIP_PROMPT copr enable erovia/dfu-programmer
     fi