Remove visualization editor background (#4719)

* Remove vis editor background

Signed-off-by: Matt Provost <provomat@amazon.com>

* Update changelog

Signed-off-by: Matt Provost <provomat@amazon.com>

---------

Signed-off-by: Matt Provost <provomat@amazon.com>
Signed-off-by: Josh Romero <rmerqg@amazon.com>
Co-authored-by: Josh Romero <rmerqg@amazon.com>

CHANGELOG.md

@@ -25,6 +25,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Reduce the amount of comments in compiled CSS ([#4648](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/4648))
 - [Saved Object Service] Customize saved objects service status ([#4696](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/4696))
 - [Discover] Update styles to compatible with OUI `next` theme ([#4644](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/4644))
+- Remove visualization editor sidebar background ([#4719](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/4719))
 - [Vis Colors] Remove customized colors from sample visualizations and dashboards ([#4741](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/4741))
 
 ### 🐛 Bug Fixes

src/plugins/vis_default_editor/public/_default.scss

@@ -12,7 +12,6 @@
  */
 
 .visEditor__collapsibleSidebar {
-  background: $euiColorLightestShade;
   min-width: $vis-editor-sidebar-min-width;
   max-width: 100%;
   position: relative;