Add a-btn--hide-icon class

[anselmbradford]

When a button with an animating "updating" icon is used, the icon would generally be hidden when the action is complete. However, the DS did not have a standard way of hiding the icon and applications set their own CSS to accomplish this (e.g. https://www.consumerfinance.gov/privacy/records-access/). This PR adds a class that hides the icon (and the icon divider!)

Additions

• Add a-btn--hide-icon class

Testing

1. Visit the buttons page in the PR preview and edit any button with icon CSS to add a-btn a-btn--hide-icon and see that the icon and divider magically disappear! 🪄

[netlify]

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[contolini]

Normally I'd advocate for just using the u-hidden utility class but it's the nested SVGs that need targeting so this looks good 👍