Fixes #2401

• This PR contains CSS changes
• This PR does not contain CSS changes

Description

1. I fixed the list and gallery variation minimal screen/container buttons so that any container/screen under 320px will use the actual css props. The css props implemented initially weren't actually being used for the respective button layouts.
2. I changed the default gallery variation minimal screen/container (< 320px) buttons to 2 since it has since now been using that inheriting the min layout button css prop, to avoid breaking current implementations and since it looks better overall.
3. I added 3 minimal layout (< 320px) exceptions for more implementation flexibility with any of the layout type buttons.
4. I added a few stories, both for the missing use cases and for the new minimal container exceptions for all the button layouts.

Screenshots

Before

After

Checklist

• I verify the build is in a non-broken state
• I verify all changes are within scope of the linked issue

• I regenerated all CSS files under dist folder
• I tested the UI in all supported browsers
• I did a visual regression check of the components impacted by doing a Percy build and approved the build
• I tested the UI in dark mode and RTL mode
• I added/updated/removed Storybook coverage as appropriate