…ePagination` component defaults (elastic#6993)

`v86.0.0`⏩`v87.1.0`

⚠️ The biggest set of type changes in this PR come from the breaking
change that makes `pageSize` and `pageSizeOptions` now optional props
for `EuiBasicTable.pagination`, `EuiInMemoryTable.pagination` and
`EuiDataGrid.pagination`.

This caused several other components that were cloning EUI's pagination
type to start throwing type warnings about `pageSize` being optional.
Where I came across these errors, I modified the extended types to
require `pageSize`. These types and their usages may end up changing
again in any case once the Shared UX team looks into
#56406.

---

## [`87.1.0`](https://github.com/elastic/eui/tree/v87.1.0)

- Updated the underlying library powering `EuiAutoSizer`. This primarily
affects typing around the `disableHeight` and `disableWidth` props
([#6798](elastic/eui#6798))
- Added new `EuiAutoSize`, `EuiAutoSizeHorizontal`, and
`EuiAutoSizeVertical` types to support `EuiAutoSizer`'s now-stricter
typing ([#6798](elastic/eui#6798))
- Updated `EuiDatePickerRange` to support `compressed` display
([#7058](elastic/eui#7058))
- Updated `EuiFlyoutBody` with a new `scrollableTabIndex` prop
([#7061](elastic/eui#7061))
- Added a new `panelMinWidth` prop to `EuiInputPopover`
([#7071](elastic/eui#7071))
- Added a new `inputPopoverProps` prop for `EuiRange`s and
`EuiDualRange`s with `showInput="inputWithPopover"` set
([#7082](elastic/eui#7082))

**Bug fixes**

- Fixed `EuiToolTip` overriding instead of merging its
`aria-describedby` tooltip ID with any existing `aria-describedby`s
([#7055](elastic/eui#7055))
- Fixed `EuiSuperDatePicker`'s `compressed` display
([#7058](elastic/eui#7058))
- Fixed `EuiAccordion` to remove tabbable children from sequential
keyboard navigation when the accordion is closed
([#7064](elastic/eui#7064))
- Fixed `EuiFlyout`s to accept custom `aria-describedby` IDs
([#7065](elastic/eui#7065))

**Accessibility**

- Removed the default `dialog` role and `tabIndex` from push
`EuiFlyout`s. Push flyouts, compared to overlay flyouts, require manual
accessibility management.
([#7065](elastic/eui#7065))

## [`87.0.0`](https://github.com/elastic/eui/tree/v87.0.0)

- Added beta `componentDefaults` prop to `EuiProvider`, which will allow
configuring certain default props globally. This list of components and
defaults is still under consideration.
([#6923](elastic/eui#6923))
- `EuiPortal`'s `insert` prop can now be configured globally via
`EuiProvider.componentDefaults`
([#6941](elastic/eui#6941))
- `EuiFocusTrap`'s `crossFrame` and `gapMode` props can now be
configured globally via `EuiProvider.componentDefaults`
([#6942](elastic/eui#6942))
- `EuiTablePagination`'s `itemsPerPage`, `itemsPerPageOptions`, and
`showPerPageOptions` props can now be configured globally via
`EuiProvider.componentDefaults`
([#6951](elastic/eui#6951))
- `EuiBasicTable`, `EuiInMemoryTable`, and `EuiDataGrid` now allow
`pagination.pageSize` to be undefined. If undefined, `pageSize` defaults
to `EuiTablePagination`'s `itemsPerPage` component default.
([#6993](elastic/eui#6993))
- `EuiBasicTable`, `EuiInMemoryTable`, and `EuiDataGrid`'s
`pagination.pageSizeOptions` will now fall back to
`EuiTablePagination`'s `itemsPerPageOptions` component default.
([#6993](elastic/eui#6993))
- Updated `EuiHeaderLinks`'s `gutterSize` spacings
([#7005](elastic/eui#7005))
- Updated `EuiHeaderAlert`'s stacking styles
([#7005](elastic/eui#7005))
- Added `toolTipProps` to `EuiListGroupItem` that allows customizing
item tooltips. ([#7018](elastic/eui#7018))
- Updated `EuiBreadcrumbs` to support breadcrumbs that toggle popovers
via `popoverContent` and `popoverProps`
([#7031](elastic/eui#7031))
- Improved the contrast ratio of disabled titles within `EuiSteps` and
`EuiStepsHorizontal` to meet WCAG AA guidelines.
([#7032](elastic/eui#7032))
- Updated `EuiSteps` and `EuiStepsHorizontal` to highlight and provide a
more clear visual indication of the current step
([#7048](elastic/eui#7048))

**Bug fixes**

- Single uses of `<EuiHeaderSectionItem side="right" />` now align right
as expected without needing a previous `side="left"` sibling.
([#7005](elastic/eui#7005))
- `EuiPageTemplate` now correctly displays `panelled={true}`
([#7044](elastic/eui#7044))

**Breaking changes**

- `EuiTablePagination`'s default `itemsPerPage` is now `10` (was
previously `50`). This can be configured through
`EuiProvider.componentDefaults`.
([#6993](elastic/eui#6993))
- `EuiTablePagination`'s default `itemsPerPageOptions` is now `[10, 25,
50]` (was previously `[10, 20, 50, 100]`). This can be configured
through `EuiProvider.componentDefaults`.
([#6993](elastic/eui#6993))
- Removed `border` prop from `EuiHeaderSectionItem` (unused since
Amsterdam theme) ([#7005](elastic/eui#7005))
- Removed `borders` object configuration from `EuiHeader.sections`
([#7005](elastic/eui#7005))

**CSS-in-JS conversions**

- Converted `EuiHeaderAlert` to Emotion; Removed unused
`.euiHeaderAlert__dismiss` CSS
([#7005](elastic/eui#7005))
- Converted `EuiHeaderSection`, `EuiHeaderSectionItem`, and
`EuiHeaderSectionItemButton` to Emotion
([#7005](elastic/eui#7005))
- Converted `EuiHeaderLinks` and `EuiHeaderLink` to Emotion; Removed
`$euiHeaderLinksGutterSizes` Sass variables
([#7005](elastic/eui#7005))
- Removed `$euiHeaderBackgroundColor` Sass variable; use
`$euiColorEmptyShade` instead
([#7005](elastic/eui#7005))
- Removed `$euiHeaderChildSize` Sass variable; use `$euiSizeXXL` instead
([#7005](elastic/eui#7005))

---------

Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>
Co-authored-by: Patryk Kopyciński <contact@patrykkopycinski.com>