fix(helm): do not override CHECKPOINT_PATH

[ upstream commit b38d591 ]

[ Backporter's notes: conflicts due to structure around daemonset
  manifest having changed in #16795, which was not backported to v1.10.
  Changes have been manually reapplied where appropriate in
  `install/kubernetes/cilium/templates/cilium-nodeinit-daemonset.yaml`.
]

Take advantage of the dynamic CHECKPOINT_PATH in the startup-script:
https://github.com/cilium/image-tools/blob/396d5a19690229b42398a8be63b5712ea64a2601/images/startup-script/manage-startup-script.sh#L58

Signed-off-by: Raphaël Pinson <raphael@isovalent.com>
Signed-off-by: Nicolas Busseneau <nicolas@isovalent.com>

install/kubernetes/cilium/templates/cilium-nodeinit-daemonset.yaml

@@ -173,8 +173,6 @@ spec:
                     echo "Node de-initialization complete"
 {{- end }}
           env:
-          - name: CHECKPOINT_PATH
-            value: /tmp/node-init.cilium.io
           # STARTUP_SCRIPT is the script run on node bootstrap. Node
           # bootstrapping can be customized in this script. This script is invoked
           # using nsenter, so it runs in the host's network and mount namespace using