Wildcard: `<Card />` migration

Created by: umpox

closes https://github.com/sourcegraph/sourcegraph/issues/27681

Description

Automated migration of the card card-* styles to the <Card /> WIldcard component. Powered by this codemod: https://github.com/sourcegraph/codemod/pull/73 (This PR is basically super rough as it just required tweaking an existing codemod to migrate. Migration is priority here, will cleanup codemod afterwards)

This PR:

• Fully migrates usage of Bootstrap card-* classes to the Wildcard <Card /> component
• Removes global Card styles and classNames
• Adds CardFooter Wildcard component
• Some styling tweaks

Notes

• The original Card migration involved tweaking the UI to match the Wildcard redesign Card styles. It means there was a chance of some small regressions for the padding of our cards after this migration. I have checked every CardBody and Card that could be affected and removed some redundant padding styles!