createdisk: Remove the fedora-updates repo after install qemu-user-static

If we don't remove that, it going to use for other packages instead of
getting it from rhel side.

Recently with ocp bundle for arm64 we found that this repo caused issue
for gvisor rpms.

```
$ rpm -qa | grep gvisor
gvisor-tap-vsock-gvforwarder-0.8.5-1.fc41.aarch64
gvisor-tap-vsock-0.8.5-1.fc41.aarch64
```

Author: praveenkumar

createdisk.sh

@@ -158,6 +158,7 @@ EOF
    ${SCP} /tmp/fedora-updates.repo core@${VM_IP}:/tmp
    ${SSH} core@${VM_IP} -- "sudo mv /tmp/fedora-updates.repo /etc/yum.repos.d"
    ${SSH} core@${VM_IP} -- "sudo rpm-ostree install qemu-user-static-x86"
+   ${SSH} core@${VM_IP} -- "sudo rm -fr /etc/yum.repos.d/fedora-updates.repo"
 fi
 
 # Beyond this point, packages added to the ADDITIONAL_PACKAGES variable won’t be installed in the guest