* Issue: Tabs widget's child canvas widget's minHeight is not updating
* Fix: Warning removed for unused onTabChange event handler by removing event handler from props passed to ScrollableCanvasWrapper
* Removed tab container not working as droppable component if added again with same name fixed
* Selecting first tab as default tab when no tab is selected in tabs widget. Used getNextEntityName funciton to generate new tab name
* Fixed tabs widget bugs and other updates:
1. Moved drag icon to the left of tab name field in the tabs widget property pane
2. Change drag icon
3. Add scroll when the tabs occupy more width than the width of tabs widget.
4. Add selected tab name validation.
5. Hide overflow tabs.
6. Avoid vertical scrollbars in tabs widget header
