Feat(context menu): Add the hideContextMenuKebab option to groups

[jenny-s51]

What

Closes #254

Description

Adds prop hideContextMenuKebab to toggle context menu via Shift + Right Click only. cc @ferhoyos

To test:

In StyleGroup.tsx, add hideContextMenuKebab as a prop of the DefaultGroup component. In the demo app, go to Styles -> Groups -> Collapsible Groups. Verify the menu kebab is hidden and can be toggled with Shift + Right click.

Type of change

• Feature
• Bugfix
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

Screen shots / Gifs for design review

Before:

After:

[patternfly-build]

Preview: https://react-topology-pr-topology-261.surge.sh

[jeff-phillips-18]

@jenny-s51 If we can add:

      onContextMenu={options.contextMenus ? onContextMenu : undefined}
      hideContextMenuKebab={options.hideKebabMenu}

to packages/demo-app-ts/src/demos/topologyPackageDemo/DemoGroup.tsx then we can demo this feature in the Topology Package demo

[jenny-s51]

Great idea, thanks @jeff-phillips-18 ! Included your suggestion