Fix snapshots tests to have less changes between commits

[jonrohan]

Follow up to https://github.com/primer/view_components/pull/1454 and https://github.com/primer/view_components/pull/1449

I realized the reason the machine was adding new images for the focus state on the autocomplete, was because the caret line was blinking.

In this PR, I'm fixing that by injecting CSS to make the caret transparent. https://developer.mozilla.org/en-US/docs/Web/CSS/caret-color

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Edit: I wonder if the best way to fix this is to scrap cuprite and go with playwrite. It would fix #1380 and align with a better solution for us.

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Latest commit: a385215156fa3a47893df2154cb6306d9074cc7e

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