Lint out-of-bounds bootmagic config

[zvecr]

Description

Requires #25898.

Regular keyboard:

• bootmagic.matrix location should be within the defined matrix size.

Split keyboard:

• bootmagic.matrix location should be within the left hand.
• split.bootmagic.matrix location should be within the right hand.

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).