[EuiRange] Remove tick label scrollbars in Safari

[thompsongl]

Summary

Fixes #5425 by adding overflow-y: hidden; to the tick label elements.

Note that this bug only affects Safari, and is really only noticeable when system scrollbars are configured to show "Always" (System Preferences > General > Show scrollbars)

overflow: hidden; was not used because we override overflow-x in the case of custom labels.
Pink: Desired label truncation
Orange: Desired label overflow

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 any docs examples
- [ ] Added or updated jest and cypress 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_5427/

[cee-chen]

I can confirm this is fixed for me on Safari with scrollbars set to "Always"! 🎉

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_5427/

[elizabetdev]

Thanks @thompsongl! I tested in Safari with System Preferences > General > Show scrollbars and LGTM! 🎉

I also tested in Firefox and Chrome.