[Emotion] Memoize batch of basic/simple components

[cee-chen]

Summary

Part of #7561

This PR memoizes a swathe of basic euiComponentStyles(useEuiTheme()) ➡️ useEuiMemoizedStyles(euiComponentStyles) conversions. Some minor code syntax/lint type cleanups were made, but should not be major refactors.

VRT

While here, I took the opportunity to re-run our VRT screenshots per-component to both check for regressions and handle minute font-level updates (see #8074 (comment)).

@mgadewoll, I'd be curious to hear more thoughts on whether the VRT changes feel excessive to you. Could you try pulling this PR down and running, e.g. yarn loki update --storiesFilter EuiDragDropContext and see if it outputs a new screenshot for you or if it remains the same?

If that generates snapshot updates for you (argh), maybe we could consider changing the either the diffing engine that Loki uses, or the diff threshold?

QA

N/A, regression testing should be handled by VRT and/or snapshots

General checklist

• Browser QA - N/A, should be handled by VRT
• Docs site QA - N/A
• Code quality checklist - N/A, all tests should pass
• Release checklist - N/A, skipping a changelog as this is mostly tech debt and shouldn't affect either consumers or end-users
• Designer checklist - N/A

[kibanamachine]

Preview staging links for this PR:

• Docs site: https://eui.elastic.co/pr_8171/
• Storybook: https://eui.elastic.co/pr_8171/storybook
• New docs: https://eui.elastic.co/pr_8171/new-docs

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 42d4994

[mgadewoll]

@cee-chen I ran VRT locally for your PR on all components memoized in this PR and there were no new reference image updates 🎉
(based on a few quick checks, there are still other components that do result in updates around font rendering)

[mgadewoll]

🚢 🐈‍⬛ Changes look good to me! Thanks for tackling some of the leftover tech debt! 🧹

[mgadewoll]

TIL this existed! 😄

[cee-chen]

lol same. We have so many handy utils in services that go unnoticed 😅

[cee-chen]

Thanks for checking Lene! I'll continue updating VRT screenshots for components as I memoize their styles, and then we can do one final VRT update after which hopefully shouldn't be too much at once.