Remove visualization editor background (opensearch-project#4719) (ope…

…nsearch-project#4753)

* 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>
(cherry picked from commit 454fdfb)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

# Conflicts:
#	CHANGELOG.md

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

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;