chore(charts): remove MicroBarChart (SAP#6249)

BREAKING CHANGE: the `MicroBarChart` component as been removed as this is a legacy component which is not covered by design specs anymore.

Author: MarcusNotheis

docs/MigrationGuide.mdx

@@ -184,6 +184,7 @@ You can find a more detailed documentation [here](?path=/docs/knowledge-base-com
 - `TableGroupRow` has been removed.
 - `NotificationAction` has been removed. You can use the `Menu` component instead.
 - `SelectMenu` and `SelectMenuOption` have been removed. The `Select` and `Option` now allow custom content.
+- `MicroBarChart` has been removed (from `@ui5/webcomponents-react-charts`) as it is not covered by design specs anymore.
 
 ## Renamed Components