[OverflowMenu, OverflowMenuItem] Overflow menus are truncated

[kshiti-p]

Describe the bug

The full text for each menu should be visible. For example, "Export report definition" shows as "Export report defi...".

To Reproduce

Steps to reproduce the behavior:

1. Go to [https://carbon-addons-iot-react.com/?path=/story/1-watson-iot-menus-overflowmenu--basic]
2. Click on overflow menu
3. Scroll down to see option 2
4. See that it is clipped, user need to hover over the menu to see the full text.

Expected behavior

user should be able to see the whole text of the menu, try to adjust width of the overflow menu according to the max width of the menu item.