:bug: fix: properly restart cloud-init

[faiq]

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What type of PR is this? /kind fix

What this PR does / why we need it:

It seems that systemctl restart clout-init is no longer sufficient to start the cloud-init process again with the secret userdata. After some googling I found the following steps to restart it without needing to reboot the machine. The step comes from here https://cloudinit.readthedocs.io/en/latest/howto/rerun_cloud_init.html

We should move towards an approach that doesn't require a restart of cloud-init to handle secret userdata.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #5115

Special notes for your reviewer:

Checklist:

• [x] squashed commits
• [ ] includes documentation
• [ ] includes emojis
• [ ] adds unit tests
• [ ] adds or updates e2e tests

Release note:

fix: uses different commands to restart cloud-init