Send NOT_KEYGUARD widget category exclusion filter to the widget picker

The newly added NOT_KEYGUARD category enables hosts that shows all
widgets to let widgets opt out from being displayed in keyguard like
surfaces.

Bug: 394047125
Test: Support app (see demos)
Flag: EXEMPT bugfix
Change-Id: Ied6d5f486eb8e17ba642431ead4baf63c9591f32