[Notif redesign] Update call layouts

Make the structure more consistent with the other templates, including
showing the top line with the app name above the text in the expanded
form. This also means that although previously we'd use the expanded
layout for HUNs, now we just use the collapsed layout (that also has the
smart replies/actions containers), similar to what we do for messaging
style.

Note that the new notification_2025_template_collapsed_call.xml and
notification_2025_template_expanded_call.xml are a combination of
notification_2025_template_collapsed_conversation.xml/
notification_2025_template_collapsed_base.xml and
notification_2025_template_expanded_conversation.xml/
notification_2025_template_expanded_base.xml respectively.

Bug: 378660052
Test: tested manually + screenshot tests
Flag: android.app.notifications_redesign_templates
Change-Id: I88276e0a2a3480d63ca728369aac724278e17827