This also includes some updates to the components of the default theme but shouldn't be any visual changes.

Changed EuiSuperSelect from using EuiPopover with custom styles to EuiInputPopover

This allowed me to remove a lot of placement logic that was already present in EuiInputPopover.

EuiComboBox now uses the same classes as EuiPopover's panel

Instead of duplicating styles and the increase in maintenance, I've copied the euiPopover__panel classes onto the EuiPanel within EuiComboBox to help maintain consistency of styles. I've added a comment in the code indicating that in a future re-factor of this component, it should just straight up use the EuiPopover component.

Also fixed the scrollbar and extra height issues.

Removed animation from EuiInputPopover (or whenever it is "attached")

This animation was just too much when it would end up connected to the input. So I only added the transition if the attached class doesn't exist.

Before

After

Fixed the date picker's dropdown and the datepicker range's input radius

This one was overlooked during the form updates. There's still more work to do on the datepicker itself, but this just fixes the immediate.

Also fixed #4218 by just completely removing the breakpoint that would hide the time select on mobile.

The picker just barely fit on a 320px wide screen anyway. We'll circle back to better mobile support when we re-write this component.

Checklist

• Check against all themes for compatibility in both light and dark modes
• Checked in mobile
• Checked in Chrome, Safari, Edge, and Firefox
• [ ] Props have proper autodocs
• [ ] Added documentation
• [ ] Checked Code Sandbox works for the any docs examples
• Added or updated jest tests
• [ ] Checked for breaking changes and labeled appropriately
• [ ] Checked for accessibility including keyboard-only and screenreader modes
• A changelog entry exists and is marked appropriately