fix(MNT-429): added theme variables to Tag field plugin

[nathinho89]

Jira Ticket:

https://storyblok.atlassian.net/browse/MNT-429

Description

This PR introduces the required theme variables for the dark and dark-high-contrast themes that are set in the Storyblok app.

Screenshots

Dark variables:

Light variables:

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[demetriusfeijoo]

Hey @nathinho89 🙌

The code looks good, but for some reason, it didn't work on the Visual Editor.

See:

I guess it is because this plugin didn't have the theme attribute added to its HTML.

[demetriusfeijoo]

Hey @nathinho89 🙌
Thanks for taking care of the theme handling. I have tested, and visually, it looks perfect both in the Field Plugin Editor and Visual Editor 🚀

I have left some suggestions, though, with small improvements, so we use the design tokens the most 🚀

Please, let me know what you think 🙏

I'm also wondering if it would be possible to not use !important in some places, but increase the selector specificity, maybe. Wdyt? 🤔

[nathinho89]

Thanks @demetriusfeijoo - your comments have now been actioned 😄

[demetriusfeijoo]

Nice job @nathinho89 🚀 🚀

I think it is our first plugin using the design-tokens and handling properly different themes 😍 😍

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