Use template variables instead of LIMA_CIDATA_* bash variables

[jandubois]

Should only be merged once #2121 has been included in a release.

[jandubois]

Updated to include examples/k8s.yaml changes from #2102.

Also added a warning when LIMA_CIDATA appears in a provisioning script, as agreed to in #2055 (comment).

I first included the script in the warning text as well, but then decided that would be too annoying for users still running older instances:

$ l ls
WARN[0000] provisioning scripts should not reference the LIMA_CIDATA variables: "#!/bin/bash\nset -eux -o pipefail\nexport KUBECONFIG=/etc/kubernetes/admin.conf\nmkdir -p ${LIMA_CIDATA_HOME}/.kube\ncp -f $KUBECONFIG ${LIMA_CIDATA_HOME}/.kube/config\nchown -R ${LIMA_CIDATA_USER} ${LIMA_CIDATA_HOME}/.kube\n"
NAME    STATUS     SSH                VMTYPE    ARCH      CPUS    MEMORY    DISK      DIR
k8s     Running    127.0.0.1:52532    qemu      x86_64    4       4GiB      100GiB    ~/.lima/k8s

[AkihiroSuda]

Thanks