Allow core/default networking addons on auto-mode clusters with mixed node types

[cheeseandcereal]

Description

Fixes #8292

This PR allows the creation of default addons on clusters configured for auto mode, if they also have other compute types configured (specifically fargate profiles or hybrid nodes remote networking config, since self managed/managed nodes are not allowed to be created with auto mode clusters).

This also updates the check to only check for non-auto default addons, instead of all default addons. This allows creating, for example, metrics-server, which is a default addon which should be able to be created with auto-mode only clusters.

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?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟