Restrict visibility of SHORTCUT_INVOCATION events.

UsageStats will not return SHORTCUT_INVOCATION events to callers
of #queryEvents and #queryEventsForUser if they don't have visibility,
as defined by ShortcutService#hasShortcutHostPermission.

Also, add ACCESS_SHORTCUT permission to shell for CTS test and add the
ShortcutManagerUsageTest to postsubmit.

Bug: 145549490
Test: atest android.app.usage.cts.UsageStatsTest
Test: atest android.content.pm.cts.shortcutmanager.ShortcutManagerUsageTest
Change-Id: I2a69f061c35c31035a5d0381ab2f42029ec4fffc