[Discover] Integrate unified field list filters into Discover (elasti…

…c#148547)

Closes elastic#145081
Part 1 of this integration was done in
elastic#147255

<img width="640" alt="Screenshot 2023-01-16 at 16 58 59"
src="https://user-images.githubusercontent.com/1415710/212720438-8f37eb69-635a-4611-89bb-34b095d79b8c.png">


## Summary

This PR integrates the unified field list filters and search into
Discover.
- [x] Integrate into Discover
- [x] Clean up deprecated code ("searchable"/"aggregatable" filters were
removed too)
- [x] Refactor field icons, labels, desc to use the unified ones
- [x] Field list in SQL view needs refactoring to use the received field
types rather than data view field types
- [x] Update tests

### Checklist

- [x] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)
- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [x] This renders correctly on smaller devices using a responsive
layout. (You can test this [in your
browser](https://www.browserstack.com/guide/responsive-testing-on-local-server))
- [x] This was checked for [cross-browser
compatibility](https://www.elastic.co/support/matrix#matrix_browsers)

Co-authored-by: Kibana Machine <[email protected]>
Co-authored-by: Stratoula Kalafateli <[email protected]>

src/plugins/discover/public/application/main/components/layout/discover_layout.scss

@@ -31,10 +31,6 @@ discover-app {
   overflow: hidden;
 }
 
-.dscPageBody__sidebar {
-  position: relative;
-}
-
 .dscPageContent__wrapper {
   padding: $euiSizeS $euiSizeS $euiSizeS 0;
   overflow: hidden; // Ensures horizontal scroll of table

src/plugins/discover/public/application/main/components/layout/discover_layout.tsx

@@ -321,7 +321,7 @@ export function DiscoverLayout({
           history={history}
         />
         <EuiFlexGroup className="dscPageBody__contents" gutterSize="s">
-          <EuiFlexItem grow={false} className="dscPageBody__sidebar">
+          <EuiFlexItem grow={false}>
             <SidebarMemoized
               documents$={stateContainer.dataState.data$.documents$}
               onAddField={onAddColumn}

src/plugins/discover/public/application/main/components/sidebar/discover_field.tsx

@@ -20,19 +20,19 @@ import {
 import { i18n } from '@kbn/i18n';
 import { UiCounterMetricType } from '@kbn/analytics';
 import classNames from 'classnames';
-import { FieldButton, FieldIcon } from '@kbn/react-field';
+import { FieldButton } from '@kbn/react-field';
 import type { DataViewField, DataView } from '@kbn/data-views-plugin/public';
 import {
+  FieldIcon,
   FieldPopover,
   FieldPopoverHeader,
   FieldPopoverHeaderProps,
   FieldPopoverVisualize,
+  getFieldIconProps,
   wrapFieldNameOnDot,
 } from '@kbn/unified-field-list-plugin/public';
 import { DiscoverFieldStats } from './discover_field_stats';
-import { getTypeForFieldIcon } from '../../../../utils/get_type_for_field_icon';
 import { DiscoverFieldDetails } from './deprecated_stats/discover_field_details';
-import { getFieldTypeName } from '../../../../utils/get_field_type_name';
 import { useDiscoverServices } from '../../../../hooks/use_discover_services';
 import { SHOW_LEGACY_FIELD_TOP_VALUES, PLUGIN_ID } from '../../../../../common';
 import { getUiActions } from '../../../../kibana_services';
@@ -59,10 +59,7 @@ const FieldInfoIcon: React.FC = memo(() => (
 ));
 
 const DiscoverFieldTypeIcon: React.FC<{ field: DataViewField }> = memo(({ field }) => {
-  const typeForIcon = getTypeForFieldIcon(field);
-  return (
-    <FieldIcon type={typeForIcon} label={getFieldTypeName(typeForIcon)} scripted={field.scripted} />
-  );
+  return <FieldIcon {...getFieldIconProps(field)} />;
 });
 
 const FieldName: React.FC<{ field: DataViewField; highlight?: string }> = memo(