Add cancel functionality to job progress items

This also dismisses items when they are cancelled.

Bug: 400352714
Test: atest -c 'DocumentsUIGoogleTests:com.android.documentsui.JobPanelUiTest'
Flag: com.android.documentsui.flags.visual_signals_ro
Change-Id: I218b6cedebcbd2205e514e7d5a1acb656cc7751f