[Security Solution] Adjusts the width of the Actions column and act…

…ion icon buttons (elastic#118454)

## [Security Solution] Adjusts the width of the `Actions` column and action icon buttons

This PR adjusts the width of the `Actions` column, and normalizes the action icon button sizes throughout the Security Solution, per elastic#115726

### Before / after screenshots

This section provides before / after screenshots for the following views:

- Alerts
- Alerts > Event rendered
- Rules > Details
- Rules > Details > Event rendered
- Host > Events
- Host > External alerts
- Network > External alerts
- Timeline > Query tab
- Timeline > Correlation tab
- Timeline > Pinned tab
- Observability > alerts (no change)

#### Alerts (before)

![01-security_alerts_before](https://user-images.githubusercontent.com/4459398/141429498-a6040f8b-5bfb-468e-aa1a-993caa7f179c.png)

#### Alerts (after)

![01a-security_alerts_after](https://user-images.githubusercontent.com/4459398/141429618-8ad313e1-fabc-424e-9e7d-c24240861c1d.png)

#### Alerts > Event rendered (before)

![02-security_alerts_event_rendered_before](https://user-images.githubusercontent.com/4459398/141430881-2bfeb57a-9881-47f1-99e4-cc7eadcfff69.png)

#### Alerts > Event rendered (after)

![02a-security_alerts_event_rendered_after](https://user-images.githubusercontent.com/4459398/141430976-88f8099a-81b1-4f1c-99a2-26f86218f909.png)

#### Rules > Details (before)

![03-security_rules_details_before](https://user-images.githubusercontent.com/4459398/141431149-a308f171-a170-4ce9-9616-77e5c08dc406.png)

#### Rules > Details (after)

![03a-security_rules_details_after](https://user-images.githubusercontent.com/4459398/141431221-06701540-97bb-400a-97bf-f2d22cd65caf.png)

#### Rules > Details > Event rendered (before)

![04-security_rule_details_event_rendered_before](https://user-images.githubusercontent.com/4459398/141431394-12b29689-41c8-44b6-b69f-7796f99c5424.png)

#### Rules > Details > Event rendered (after)

![04a-security_rule_details_event_rendered_after](https://user-images.githubusercontent.com/4459398/141431477-049804c0-1455-4216-a241-a44df5c9d398.png)

#### Host > Events (before)

![05-host_events_before](https://user-images.githubusercontent.com/4459398/141431858-31116980-47f7-4779-af26-3b3785638137.png)

#### Host > Events (after)

![05a-host_events_after](https://user-images.githubusercontent.com/4459398/141431956-664f86b9-2ad7-4281-bf82-8278fa23c755.png)

#### Host > External alerts (before)

![06-host_external_alerts_before](https://user-images.githubusercontent.com/4459398/141432103-8cc9c10e-4d2d-42ec-a62c-a1e5867bf2d8.png)

#### Host > External alerts (after)

![06a-host_external_alerts_after](https://user-images.githubusercontent.com/4459398/141432185-4d7e4007-dea9-47f3-af4b-1719f338a5ba.png)

#### Network > External alerts (before)

![07-network_external_alerts_before](https://user-images.githubusercontent.com/4459398/141432331-2bb5a714-f733-4c97-91dc-73ff76633daa.png)

#### Network > External alerts (after)

![07a-network_external_alerts_after](https://user-images.githubusercontent.com/4459398/141432428-b7b20450-db87-44ab-8014-cf4d6032dfe3.png)

#### Timeline > Query tab (before)

![08-timeline_query_tab_before](https://user-images.githubusercontent.com/4459398/141432638-e484813b-275d-4eff-aa38-1705f913ce59.png)

#### Timeline > Query tab (after)

![08a-timeline_query_tab_after](https://user-images.githubusercontent.com/4459398/141434461-1d36bba5-8fd1-484a-bacd-733aede95815.png)

#### Timeline > Correlation tab (before)

![09-timeline_correlation_tab_before](https://user-images.githubusercontent.com/4459398/141434637-33f05447-e3d3-4eac-b38a-3612945e8379.png)

#### Timeline > Correlation tab (after)

![09a-timeline_correlation_tab_after](https://user-images.githubusercontent.com/4459398/141434751-250fd26b-25fc-48cc-8a06-dbb17e53dce7.png)

#### Timeline > Pinned tab (before)

![10-timeline_pinned_tab_before](https://user-images.githubusercontent.com/4459398/141434893-3f2b3d17-7e4b-4e0c-9096-ab1ee57f096f.png)

#### Timeline > Pinned tab (after)

![10a-timeline_pinned_tab_after](https://user-images.githubusercontent.com/4459398/141435431-26eac065-bce4-4a25-99fd-095d447fb6f3.png)

#### Observability > alerts (before)

![11-observability_alerts_before](https://user-images.githubusercontent.com/4459398/141435607-da059e9c-af03-4a21-bb1b-e47d44d61dde.png)

#### Observability > alerts (after / no change)

![11a-observability_alerts_after_no_change](https://user-images.githubusercontent.com/4459398/141435696-52bcc5e1-6823-4b6a-b2da-32e3f8733dc8.png)

### Additional details

- Per [this comment](elastic#115726 (comment)) from @monina-n , the size of all action buttons have been normalized match the size off the `...` overflow button (`28 x 32` at the time of this writing) via the `EuiButtonIcon` `size` prop:

```
size="s"
```

- The horizontal alignment of the `Analyze event` icon was updated by the EUI team in the following PR: elastic/eui#5365

x-pack/plugins/security_solution/public/common/components/alerts_viewer/alerts_table.tsx

@@ -21,6 +21,7 @@ import { SourcererScopeName } from '../../store/sourcerer/model';
 import { useIsExperimentalFeatureEnabled } from '../../hooks/use_experimental_features';
 import { DEFAULT_COLUMN_MIN_WIDTH } from '../../../timelines/components/timeline/body/constants';
 import type { EntityType } from '../../../../../timelines/common';
+import { getDefaultControlColumn } from '../../../timelines/components/timeline/body/control_columns';
 
 export interface OwnProps {
   end: string;
@@ -79,6 +80,7 @@ const AlertsTableComponent: React.FC<Props> = ({
   const dispatch = useDispatch();
   const alertsFilter = useMemo(() => [...defaultAlertsFilters, ...pageFilters], [pageFilters]);
   const { filterManager } = useKibana().services.data.query;
+  const ACTION_BUTTON_COUNT = 3;
 
   const tGridEnabled = useIsExperimentalFeatureEnabled('tGridEnabled');
 
@@ -104,6 +106,8 @@ const AlertsTableComponent: React.FC<Props> = ({
     );
   }, [dispatch, filterManager, tGridEnabled, timelineId]);
 
+  const leadingControlColumns = useMemo(() => getDefaultControlColumn(ACTION_BUTTON_COUNT), []);
+
   return (
     <StatefulEventsViewer
       pageFilters={alertsFilter}
@@ -112,6 +116,7 @@ const AlertsTableComponent: React.FC<Props> = ({
       end={endDate}
       entityType={entityType}
       id={timelineId}
+      leadingControlColumns={leadingControlColumns}
       renderCellValue={DefaultCellRenderer}
       rowRenderers={defaultRowRenderers}
       scopeId={SourcererScopeName.default}