[FieldValueSelectionFilter] [i18n] Let `EuiSelectable` handle default loading and empty messages

[Heenawter]

Closes https://github.com/elastic/eui/issues/7714

Summary

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QA

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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
• 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
  • [ ] Updated the Figma library counterpart

[kibanamachine]

Preview staging links for this PR:

• Docs site: https://eui.elastic.co/pr_7718/
• Storybook: https://eui.elastic.co/pr_7718/storybook

[elasticmachine]

:green_heart: Build Succeeded

• Buildkite Build
• Commit: 1572a81b3fdad05ed3ccfb564a4eac545c74876c

History

• :green_heart: Build #1837 succeeded 935a0b879301c59c6b842922ace1b5ed7a24b051