[Vis Colors] Update default color in TSVB to use `ouiPaletteColorBlin…

…d()[0]` (#4363)

Signed-off-by: Manasvini B Suryanarayana <manasvis@amazon.com>
(cherry picked from commit 333e2b3)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

# Conflicts:
#	CHANGELOG.md

src/plugins/vis_type_timeseries/public/metrics_type.ts

@@ -30,6 +30,7 @@
 
 import { i18n } from '@osd/i18n';
 
+import { euiPaletteColorBlind } from '@elastic/eui';
 // @ts-ignore
 import { metricsRequestHandler } from './request_handler';
 import { EditorController } from './application';
@@ -53,7 +54,7 @@ export const metricsVisDefinition = {
       series: [
         {
           id: '61ca57f1-469d-11e7-af02-69e470af7417',
-          color: '#68BC00',
+          color: euiPaletteColorBlind()[0],
           split_mode: 'everything',
           split_color_mode: 'opensearchDashboards',
           metrics: [