Notifications: Inline demote item.

Permission revocation as MenuItem, with undo flow.

Separate flag from Guts/back of card implementation.

Still icon-only. Text coming soon.

Bug: 379186372
Test: atest SystemUiTests
Flag: com.android.systemui.permission_helper_inline_ui_rich_ongoing
Change-Id: Iac339601f74c950cffb66a8e64bc75cd23c5ad55