chore(eni): Deprecate ENI as an input configuration format #5561
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Proposed Commit Message
Additional Context
The documentation around ENI had numerous factual errors: cloud-init doesn't support ENI configuration from OpenStack or OpenNebula datasources. Only NoCloud and ConfigDrive actually support this format. Both provide distro-agnostic alternatives.
I don't think that we want to support 3 user-facing input formats indefinitely. Energy would be better spent on cloud-init's networking stack if we focused users (and developer effort) onto fewer formats.
Deprecate and un-document.
Test Steps
Merge type