Add chevron to ButtonAction

[MichaelArestad]

This is a quick solution to adding a chevron option to ButtonAction so we can use this with modes. @cdedreuille any objections?

📦 Published PR as canary version: 7.15.14-canary.425.b5a48f5.0

:sparkles: Test out this PR locally via: ```bash npm install @storybook/design-system@7.15.14-canary.425.b5a48f5.0 # or yarn add @storybook/design-system@7.15.14-canary.425.b5a48f5.0 ```

[github-actions[bot]]

:rocket: PR was released in v7.15.15 :rocket: