[release-2.6] ✨refactor: update to use new community ami account

[richardcase]

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What type of PR is this?

/kind bug

What this PR does / why we need it:

Manual cherry-pick of #5133

Updates to the project to start using the new CNCF owned AWS account for publishing AMIs. The code has had the old VMWare account removed and the new account ID added. Additionally the docs have been updated including clarifying that the public AMIs should only be used for non-production usage.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Relates #5131 Relates #4984

Special notes for your reviewer:

Checklist:

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

Release note:

action required
A new community owned AWS account is now being used for publishing AMIs. The old account owner by a company is no longer accessible and the images are being automatically deleted by AWS. Support for ubuntu 18.04 & 20.04 has been dropped and ubuntu 24.04 is now the default OS if no OS is supplied.