Storage add-on: Inconsistent price combining of the spotlight plan card

[southp]

Details

This issue is broken out from the original audit: #85773

CleanShot.2023-12-26.at.18.17.14.mp4

As demonstrated above, when we first select a storage add-on before owning one, it shows the combined price in the spotlight plan card. After that, it turns into just the plan price with some flickering between texts.

I'm not sure what's the best behavior here. It's confusing to me to show the combined price, since there is a "+X / month" under the dropdown. I'd prefer us to show them separately, sort of like the final state in the screencast. However, that doesn't align with how the other places in /plans work.

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