[BREAKING CHANGE] Fix ve.ui.Overlay classes

Rename to ve-ui-overlay-(global|local) and give the overlay
in the language input widget a global class otherwise it doesn't
shield the personal toolbar.

Breaking change: ve-ui-surface-(global|local)Overlay renamed.

Bug: 68486
Change-Id: Ia99d368a41ab581a2bd4e3e39d6fc6efe5e6ffb4
Merge "[BREAKING CHANGE] Fix ve.ui.Overlay classes"