[Docs] Remove mention of visualization:colorMapping setting (#215962)

## Summary

This PR removes the `visualization:colorMapping` setting from the
Advanced settings page.

Rel: https://github.com/elastic/kibana/pull/197802,
[#616](https://github.com/elastic/platform-docs-team/issues/616)

---------

Co-authored-by: Nick Partridge <nicholas.partridge@elastic.co>

docs/reference/advanced-settings.md

@@ -503,9 +503,6 @@ $$$timelion-targetbuckets$$$`timelion:target_buckets`
 
 ### Visualization [kibana-visualization-settings]
 
-$$$visualization-colormapping$$$`visualization:colorMapping`
-:   [7.11.0] Maps values to specific colors in charts using the **Compatibility** palette.
-
 $$$visualization-uselegacytimeaxis$$$`visualization:useLegacyTimeAxis`
 :   [8.10.0] Enables the legacy time axis for charts in Lens, Discover, Visualize and TSVB
 

src/platform/packages/shared/kbn-management/settings/setting_ids/index.ts

@@ -190,7 +190,6 @@ export const TIMELION_MIN_INTERVAL_ID = 'timelion:min_interval';
 export const TIMELION_TARGET_BUCKETS_ID = 'timelion:target_buckets';
 
 // Visualization settings
-export const VISUALIZATION_COLOR_MAPPING_ID = 'visualization:colorMapping';
 export const VISUALIZATION_HEATMAP_MAX_BUCKETS_ID = 'visualization:heatmap:maxBuckets';
 export const VISUALIZATION_USE_LEGACY_TIME_AXIS_ID = 'visualization:useLegacyTimeAxis';
 export const VISUALIZATION_LEGACY_GAUGE_CHARTS_LIBRARY_ID =

src/platform/plugins/shared/charts/common/index.ts

@@ -7,7 +7,6 @@
  * License v3.0 only", or the "Server Side Public License, v 1".
  */
 
-export const COLOR_MAPPING_SETTING = 'visualization:colorMapping';
 export const LEGACY_TIME_AXIS = 'visualization:useLegacyTimeAxis';
 
 export type {