Co-authored-by: Constance <constancecchen@users.noreply.github.com>

Co-authored-by: Constance <constancecchen@users.noreply.github.com>

…ic#5229)

* Making an explicit check for ID prop in EUI Combobox

* Checking for a user-passed ID prop
* If no user-passed ID, we'll use the `rootId()` class method to set one
* Prepend and append props need an ID to relate label to the input

* Adding example for Combobox with prepended label
* Confirmed the label `for` attribute is referencing input `id`
* Added styles to round the edges of the child `<div>` when we prepend a
  label
* Bumped package.json

* Adding CHANGELOG entry and bumping version

* Update combo_box.tsx

* Updating styles to match other forms with prepend and apppend.

* Finishing Combobox CSS and test updates
* Simplified the Amsterdam overrides for prepended / appended labels
* Added conditional classes to `combo_box.tsx`
* Added unit tests for user passed ID, prepended and appended classes

* Reordering props in child component.

* Final adjustment to ID check in ComboBox

* Final updates to styling and documentation
* Added CSS rules for compressed, prepend and append border radius
* Updated the Display Toggles to include append
* Removed a duplicated instruction paragraph
* Simplified the logic for a unique ID in combobox.ts

* Adding Combobox unique ID to master changelog

* Updated Form Control Layout SCSS
* The borders were still rounded with prepend and append enabled
* Added two more rules to make borders square for full height and compressed

* Move to _combo_box.scss

Co-authored-by: cchaos <caroline.horn@elastic.co>

* Install Cypress code coverage dependencies

* Set up required babel+istanbul config

* Set up Cypress code coverage config

@see https://github.com/cypress-io/code-coverage#instrument-unit-tests

* Add script for combining cypress & jest code coverage
-into a single json & html report

* Misc cleanup/ignores

- Ignore new `.nyc_output` dir generated by cypress/istanbul

- Improve Jest config collectCoverageFrom !ignores:
  - DRY out component+services folder patterns with a {,} glob
  - Ignore new Cypress .spec files and .testenv files for jest coverage

- eslintignore the cypress folder, since they're all .js anyway and it has a decent amount of idiosyncracies
+ cleanup unused eslint-disable
+ cleanup cypress comment boilerplate
+ remove unused paths from webpack config

* Add wiki documentation

* [PR feedback] Move nyc config to own file

* [PR feedback] Switch combine coverage script to .sh

…c#5272)

* Add remark-breaks and line break plugin to MarkdownEditor

* Update changelog

elastic#5283)

* Moved Border tokens to its own page
* Figured out a way to get subsections in the sidenav working
* Added the new `_values` under `customizing/`

* [EuiTableRowCell] Actually support `valign` property manually
* [EuiTable*] Fixing some props and mobile options
* Slightly better responsive table styles

* omit unsupported types

* resolve console errors

* CL

…failures (elastic#5317)

* Add Cypress failed test retries to CI run mode

* Increase cy.wait on flaky context menu tests (just in case)

* More hardening

* use useJsonVars

* use variable