fix(ai-gradient): ensure strings are returned as color tokens

[tw15egan]

Fixes an issue that was causing the callout-gradient to return a string instead of the provided token name

Changelog

Changed

• Use the get-var function to get the proper token game

Testing / Reviewing

Try passing in any token to the callout-gradient mixin e.g. @include callout-gradient('default', 0, 'layer');

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[carbon-automation]

Hey there! v11.50.0 was just released that references this issue/PR.