Filter out figma-only tokens

[srambach]

Design has a need to create some variables that are needed for line height (using px, per font size) but we don't want to include them as we have different tokens for line-height that work more universally across font styling.

For this issue, filter out any token containing "figma-only" and do not include them in any output.

[github-actions]

🎉 This issue has been resolved in version 1.8.0 🎉

The release is available on:

• GitHub release
• npm package (@prerelease dist-tag)

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