apply fallback variable if no connected variable

[six7]

Closes #2794

Why does this PR exist?

When a token is not connected to a variable, but the value of the token is a pure reference to a token that is connected to a variable, apply that variable, instead of what we do today, which is apply the raw hex value.

This enables users to have their semantic variables applied when their component tokens are applied - as long as they dont create component token variables.

What does this pull request do?

Adds a check to where we fetch the variableReference if there's a fallback variable we could use

Testing this change

• Create a token called red in a set called Core, create a theme group for it and enable just that set here
• Create another token called danger and use {red} as the value, in another set called Semantic (no theme group required)
• Create variables
• Apply the token for danger and see that red variable is applied

[changeset-bot]

🦋 Changeset detected

Latest commit: 894d36f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@tokens-studio/figma-plugin	Patch

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