Add auto-ssm ami resolution for ubuntu

[aciba90]

Description

Add auto-ssm ami resolution for ubuntu

Issue #3224

Checklist

• [ ] Added tests that cover your change (if possible)
• [ ] Added/modified documentation as required (such as the README.md, or the userdocs directory)
• [ ] Manually tested
• [ ] Made sure the title of the PR is a good description that can go into the release notes
• [ ] (Core team) Added labels for change area (e.g. area/nodegroup) and kind (e.g. kind/improvement)

BONUS POINTS checklist: complete for good vibes and maybe prizes?! :exploding_head:

• [ ] Backfilled missing tests for code in same general area :tada:
• [ ] Refactored something and made the world a better place :star2:

[aciba90]

Hello team. I created this PR as draft because unit tests are broken due to https://github.com/eksctl-io/eksctl/issues/7845. Will work on them after unblocked, thanks.