Remove CheckboxTree from overridable components (it was deleted from master)

Signed-off-by: Daniel Ortiz Lira <dortiz@vmware.com>

packages/core-components/src/components/index.ts

@@ -17,7 +17,6 @@
 export * from './AlertDisplay';
 export * from './Avatar';
 export * from './Button';
-export * from './CheckboxTree';
 export * from './CodeSnippet';
 export * from './CopyTextButton';
 export * from './CreateButton';

packages/core-components/src/overridableComponents.ts

@@ -18,7 +18,6 @@ import { StyleRules } from '@material-ui/core/styles/withStyles';
 
 import {
   AvatarClassKey,
-  CheckboxTreeClassKey,
   DependencyGraphDefaultLabelClassKey,
   DependencyGraphDefaultNodeClassKey,
   DependencyGraphEdgeClassKey,
@@ -95,7 +94,6 @@ import {
 
 type BackstageComponentsNameToClassKey = {
   BackstageAvatar: AvatarClassKey;
-  BackstageCheckboxTree: CheckboxTreeClassKey;
   BackstageDependencyGraphDefaultLabel: DependencyGraphDefaultLabelClassKey;
   BackstageDependencyGraphDefaultNode: DependencyGraphDefaultNodeClassKey;
   BackstageDependencyGraphEdge: DependencyGraphEdgeClassKey;