[Storybook] Add remaining stories for components starting with E-F

[cee-chen]

Summary

Skips form components, which likely need to be their own PR 😨

QA

• Confirm that the toggles & controls for all the below storybooks work as expected/reasonably
• https://eui.elastic.co/pr_7476/storybook/?path=/story/euiexpression--playground
• https://eui.elastic.co/pr_7476/storybook/?path=/story/euifacetbutton--playground
• https://eui.elastic.co/pr_7476/storybook/?path=/story/euifacetgroup--playground
• https://eui.elastic.co/pr_7476/storybook/?path=/story/euifilterbutton--regular
• https://eui.elastic.co/pr_7476/storybook/?path=/story/euifiltergroup--playground
• https://eui.elastic.co/pr_7476/storybook/?path=/story/euiflexgrid--playground
• https://eui.elastic.co/pr_7476/storybook/?path=/story/euiflexgroup--playground
• https://eui.elastic.co/pr_7476/storybook/?path=/story/euiflexitem--playground
• https://eui.elastic.co/pr_7476/storybook/?path=/story/euiflyout--playground
• https://eui.elastic.co/pr_7476/storybook/?path=/story/euiflyoutresizable--playground
• https://eui.elastic.co/pr_7476/storybook/?path=/story/euiflyoutbody--playground
• https://eui.elastic.co/pr_7476/storybook/?path=/story/euiflyoutheader--playground
• https://eui.elastic.co/pr_7476/storybook/?path=/story/euiflyoutfooter--playground
• https://eui.elastic.co/pr_7476/storybook/?path=/story/euifocustrap--playground

General checklist

N/A

[kibanamachine]

Preview staging links for this PR:

• Docs site: https://eui.elastic.co/pr_7476/
• Storybook: https://eui.elastic.co/pr_7476/storybook

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 26b9026

[tkajtoch]

Looks and works great!