Implement tooltip for styles dropdown

The new styles dropdown on the logo generator could use a tooltip to help user make sense of it, specially the "none" and "auto" options. Use https://automattic.github.io/jetpack-storybook/?path=/docs/js-packages-components-icontooltip--docs

Start at the logo generator's styles dropdown and review the linked Jetpack Storybook IconTooltip documentation. Confirm how the dropdown exposes the "none" and "auto" options, then add a tooltip that explains them; done means those options have helpful tooltip text in the logo generator.

Written by the indexing model from the issue text.