[Console] [CCI] Remove unused ul element and its custom styling. (#3993)

* remove unused ul element

Signed-off-by: Sirazh Gabdullin <sirazh.gabdullin@nu.edu.kz>

* Update CHANGELOG.md

Signed-off-by: Sirazh Gabdullin <sirazh.gabdullin@nu.edu.kz>

---------

Signed-off-by: Sirazh Gabdullin <sirazh.gabdullin@nu.edu.kz>

Author: curq

CHANGELOG.md

@@ -199,6 +199,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - [Console] Replace jQuery.ajax with core.http when calling OSD APIs in console ([#3080](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3080))
 - [I18n] Fix Listr type errors and error handlers ([#3629](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3629))
 - [Multiple DataSource] Present the authentication type choices in a drop-down ([#3693](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3693))
+- [Console] Remove unused ul element and its custom styling ([#3993](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3993))
 - Fix EUI/OUI type errors ([#3798](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3798))
 
 ### 🔩 Tests

src/plugins/console/public/application/containers/editor/legacy/console_editor/editor.tsx

@@ -231,7 +231,6 @@ function EditorUI({ initialTextValue, dataSourceId }: EditorProps) {
   return (
     <div style={abs} className="conApp">
       <div className="conApp__editor">
-        <ul className="conApp__autoComplete" id="autocomplete" />
         <EuiFlexGroup
           className="conApp__editorActions"
           id="ConAppEditorActions"

src/plugins/console/public/styles/_app.scss

@@ -77,18 +77,6 @@
   z-index: $euiZLevel1;
 }
 
-// SASSTODO: This component seems to not be used anymore?
-// Possibly replaced by the Ace version
-.conApp__autoComplete {
-  position: absolute;
-  left: -1000px;
-  visibility: hidden;
-
-  /* by pass any other element in ace and resize bar, but not modal popups  */
-  z-index: $euiZLevel1 + 2;
-  margin-top: 22px;
-}
-
 .conApp__settingsModal {
   min-width: 460px;
 }