Merge pull request #5866 from backstage/blam/export-checkbox-tree

chore: exporting `CheckboxTree` components

.changeset/poor-buttons-sparkle.md

@@ -0,0 +1,5 @@
+---
+'@backstage/core': patch
+---
+
+Export `CheckboxTree` as we have a storybook for it

packages/core/src/components/index.ts

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