Resolve keyboard_aliases when processing keyboard make targets

[zvecr]

Description

The aim is to minimise disruption to end users while we continue the deprecation process of DEFAULT_FOLDER.

Implementation is somewhat less than ideal, but hopefully its only temporary while DEFAULT_FOLDER handling still exists.

Enabled keyboard_aliases.hjson values to be used, for example

make 2_milk:default

While still allowing keyboards with DEFAULT_FOLDER to compile as before

make yosino58:default

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout (addition or update)
• Documentation

Issues Fixed or Closed by This PR

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).