Speed improvements to qmk find.

[tzarc]

Description

As discussed on discord.

Types of Changes

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

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).

[elpekenin]

Should perhaps use .setdefault('SKIP_SCHEMA_VALIDATION', '1') here, to allow users to override the value. Not that I can think about a good use case to do that, must say.

But also, with the current implementation, a value of '0' would not even override.

if not os.environ.get('SKIP_SCHEMA_VALIDATION', None)
# if not '0'
# if not bool('0')

Non-empty string evaluates to True... even though it was meant as "do not skip"