Carbon Ad CSS Stylesheet regression

[endigo9740]

Link to the Page

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Describe the Issue (screenshots encouraged!)

It looks like in the transition to v2 our ad-specific stylesheets was accidentally removed. This means the ads are reverted to their default styles. We need to investigate and resolve.

[endigo9740]

Turns out the PurgeCSS plugin was purging the ad styles because they are not used in the app at build time. Rather, the ads are injected with JS, so they don't appear until after this process. Extended the regex for the PurgeCSS in the vite.config.ts file to cover this use case.