[Emotion] Convert all color picker components

[cee-chen]

Summary

Converts the following color picker components to Emotion:

• EuiColorPicker
• EuiColorPickerSwatch
• EuiColorPalettePicker
• EuiColorPalettePickerDisplay
• EuiHue
• EuiSaturation

See #6400

Note

This PR is a feature branch merge of several PRs, which should have already been individually reviewed/QA'd:

• [Emotion] Convert EuiColorPicker #7845
• [Emotion] Convert EuiColorPickerSwatch #7853
• [Emotion] Convert EuiColorPalettePicker and EuiColorPaletteDisplay #7854
• [Emotion] Convert EuiSaturation and EuiHue #7859

QA

The majority of QA should have been performed in the above PRs, so this step is one final sanity check / smoke test:

• https://eui.elastic.co/pr_7863/#/forms/color-selection should not have any major visual regressions

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 - N/A
• Code quality checklist
  • Re-ran visual regression tests
• Release checklist - N/A, feature branch - individual PRs have their own changelogs
• Designer checklist - N/A

Emotion checklist

General

• Output CSS matches the previous CSS (works as expected in all browsers)
• Rendered className(s) read as expected in snapshots and browsers
• Checked component playground

  NOTE: Class components wrapped in withEuiTheme need to pass true as the second argument to its propUtilityForPlayground in src-docs/src/views/{component}/playground.js

---

Unit tests

• shouldRenderCustomStyles() test was added and passes with parent component and any nested childProps (e.g. tooltipProps)
• Converted Enzyme to RTL

---

Sass/Emotion conversion process

• Removed component from src/components/index.scss
• Deleted any src/amsterdam/overrides/{component}.scss files (styles within should have been converted to the baseline Emotion styles)
• Converted all global Sass vars/mixins to JS (e.g. $euiSize to euiTheme.size.base)
• Listed var/mixin removals in changelog
• [ ] Added an @warn deprecation message within the global_styling/mixins/{component}.scss file
• [ ] Removed or converted component-specific Sass vars/mixins to exported JS versions
• [ ] Ran yarn compile-scss to update var/mixin JSON files
• [ ] Simplified calc() to mathWithUnits if possible (if mixing different unit types, this may not be possible)

---

CSS tech debt

• [ ] Wrapped all animations or transitions in euiCanAnimate
• Used gap property to add margin between items if using flex
• Converted side specific padding, margin, and position to -inline and -block logical properties (check inline styles as well as CSS)

---

DOM Cleanup

• Did NOT remove any block/element classNames (e.g. euiComponent, euiComponent__child)
• SEARCH KIBANA FIRST: Deleted any modifier classNames or maps if not being used in Kibana.

---

Kibana due diligence

• Search Kibana's codebase for {euiComponent}- (case sensitive) to check for usage of modifier classes
  • [ ] If usage exists, consider converting to a data attribute so that consumers still have something to hook into
• Pre-emptively check how your conversion will impact the next Kibana upgrade. This entails searching/grepping through Kibana (excluding **/target, **/*.snap, **/*.storyshot for less noise) for eui{Component} (case sensitive) to find:
• Any test/query selectors that will need to be updated
• Any Sass or CSS that will need to be updated, particularly if a component Sass var was deleted
• Any direct className usages that will need to be refactored (e.g. someone calling the euiBadge class on a div instead of simply using the EuiBadge component)

---

Extras/nice-to-have

• Reduced specificity where possible (usually by reducing nesting and class name chaining)
• [ ] Optional component/code cleanup: consider splitting up the component into multiple children if it's overly verbose or difficult to reason about
• [ ] Documentation pass
• [ ] Check for issues in the backlog that could be a quick fix for that component

[kibanamachine]

Preview staging links for this PR:

• Docs site: https://eui.elastic.co/pr_7863/
• Storybook: https://eui.elastic.co/pr_7863/storybook
• New docs: https://eui.elastic.co/pr_7863/new-docs

[elasticmachine]

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• Commit: 613f3d7

[mgadewoll]

🚢 🐈‍⬛ I did the in depth reviews on the specific PRs but had another general check on the render and did not find any visual regressions as expected. Great conversion update! 🎉

[cee-chen]

Thanks Lene!! 🎉