[Notif redesign] Fix text cutoff

On larger font sizes, the bottom of letters like g, y and accented
characters could get cut off due to the fixed height.

This fixes that issue by using minHeight instead, and setting the height
to wrap_content. It also simplifies our templates a little bit, and
fixes a bug where the old media style wasn't using the new
notification_2025_text layout.

Bug: 378660052
Test: manually increased the font size and verified that text doesn't get cut off anymore
Flag: android.app.notifications_redesign_templates
Change-Id: I7a465fa9b4cfd27ff5fed8358572ba17031e26d2