Add clear functionality to EuiDatePickerRange

[ChrisJamesC]

Summary

Propagate the clear prop from EuiFormControlLayoutDelimited to EuiDatePickerRange so we can clear a date range in a consistent way as for other form elements.

QA

Remove or strikethrough items that do not apply to your PR.

General checklist

• Browser QA
  • Checked in both light and dark modes
  • Checked in mobile
  • Checked in Chrome, Safari, Edge, and Firefox
  • Checked for accessibility including keyboard-only and screenreader modes
• Docs site QA
  • Added documentation
  • Props have proper autodocs (using @default if default values are missing) and playground toggles
  • Checked Code Sandbox works for any docs examples
• Code quality checklist
  • Added or updated jest and cypress tests
  • Updated visual regression tests
• Release checklist
  • A changelog entry exists and is marked appropriately.
  • If applicable, added the breaking change issue label (and filled out the breaking change checklist)
• Designer checklist
  • If applicable, file an issue to update EUI's Figma library with any corresponding UI changes. (This is an internal repo, if you are external to Elastic, ask a maintainer to submit this request)

[cla-checker-service]

💚 CLA has been signed

[github-actions]

👋 Since this is a community submitted pull request, a Buildkite build has not been started automatically. Would an Elastic organization member please verify the contents of this pull request and kick off a build manually?

[weronikaolejniczak]

Hey @ChrisJamesC 👋🏻 what's the status of this PR? Do you need any guidance? 😄 Let me know and thank you for contributing!

[ChrisJamesC]

Hi @weronikaolejniczak, thanks for reaching out.
Given the limited scope of the change I'm not sure how much of the checklist I must go through.

[weronikaolejniczak]

@ChrisJamesC here are some things we'd need to do:

• add a changelog (you can refer to our wiki)
• add a unit test for clearing EuiDatePickerRange
• verify the prop is available as a control in Storybook

You can strikethrough any other checklist element.

If this PR is coming out of a feature request, let's mention it in the description (preferably with closing keywords).

Let me know once you've done the changes and I'll test. And if you need any help, don't hesitate to reach out 😄

[weronikaolejniczak]

Hey @ChrisJamesC 👋🏻 let me know if you need any guidance on moving this PR forward!