[EuiSuperDatePicker] & [EuiButtonIcon] A couple quick fixes

[cchaos]

EuiSuperDatePicker

While I had been checking the EuiSuperDatePicker's use of EuiDatePicker during #5000, I must have missed a final pass and saw that the width wasn't growing. So this is now fixed.

Before

After

Also fixed the responsive sizes:

Before

After

EuiButtonIcon

While I was testing #5054 in Kibana, I noticed that the filter in/out buttons were sometimes "disabled" but were still blue with pointer events.

I realized that EuiButtonIcon only afforded for isDisabled even though disabled was also a valid prop because of PropsForButton. And while disabled was still being applied to the rendered DOM element, the styling was not updated to get --isDisabled class.

Before:

**After: **

So now it checks for disabled as well to apply the class which apparently also fixes some internal usages of just disabled on EuiButtonIcon within EuiPagination and EuiListGroupItem.

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 and playground toggles
• 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

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_5060/

[snide]

Checked code. Tested in browser and checked mobile render. Tests look good.

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_5060/

[snide]

Looks like a prettier error in icon_example.js even though this doesn't touch it.

[cchaos]

Might have been from a previous PR where I added that. For some reason Prettier has just completely stopped working on that page in my IDE. I wonder if there's some exclusion that's including this file because it contains the work icon?

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_5060/

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_5060/

[chandlerprall]

Changes LGTM; Tested in deployed docs & locally

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_5060/