Fix RHEL-9.2 provisioning getting stuck in disabling packagekit

packagekit service can't be disabled (it's missing an [install]
section), and sometimes it gets activated by other means before
PackageKit uninstalled.

So mask the unit, and try to stop the service repeatedly in case it
resists.

Fixes: QTQAINFRA-6078
Change-Id: I2c93b548007f24f7d7f632410d146eb472e2b4fb
Reviewed-by: Simo Fält <simo.falt@qt.io>

coin/provisioning/qtci-linux-RHEL-9.2-x86_64/03-enable-repos.sh

@@ -6,10 +6,11 @@ set -ex
 
 echo "set WritePreparedUpdates=false" | sudo tee -a /etc/PackageKit/PackageKit.conf
 sudo systemctl stop packagekit
-sudo systemctl disable packagekit
+sudo systemctl mask --now packagekit
 while sudo fuser /usr/libexec/packagekitd >/dev/null 2>&1; do
     echo "Waiting for PackageKit to finish..."
     sleep 1
+    sudo systemctl stop packagekit
 done
 sudo yum -y remove PackageKit gnome-software