Fix EnvironmentFile path for kubeadm deb package

[xmudrii]

What type of PR is this?

/kind bug
/kind regression

What this PR does / why we need it:

Debian packages published to the legacy repos have EnvironmentFile in 10-kubeadm.conf set to /etc/default/kubelet. However, Debian packages published to pkgs.k8s.io have this variable set to /etc/sysconfig/kubelet

This is wrong as described in #3276 and https://kubernetes.slack.com/archives/C09NXKJKA/p1694790202990129

Moreover, this is breaking some clusters as described in #3219 (comment)

This PR is supposed to fix this issue by applying some sed magic when building packages ✨ 🧙

Which issue(s) this PR fixes:

Fixes #3276

Special notes for your reviewer:

I'll properly test this change after the PR is merged because I can't run a nomock job on a non-master branch. This fix only applies on packages published after the fix is merged, we don't have a way to alter existing packages.

/priority critical-urgent

Does this PR introduce a user-facing change?

EnvironmentFile is changed from `/etc/sysconfig/kubelet` to `/etc/default/kubelet` for `kubeadm` Debian packages published to `pkgs.k8s.io`

/assign @saschagrunert
cc @kubernetes/release-engineering

[cpanato]

/lgtm

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[pacoxu]

/cc @kubernetes/kubeadm-maintainers

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[jorhett]

This is half of the fix, the package places the defaults file in the RedHat location:

$ dpkg -L kubelet |grep /kubelet
/etc/sysconfig/kubelet

So this was halfway fixed, you're referring to an env file that doesn't exist. So the 2nd part of the fix is to adjust the file path in the package.

[xmudrii]

@jorhett This issue should be fixed by #3625