Add logs for group child notification row transient views removal

Add logs when group child notifications' row transient views are removed through removeFromTransientContainer from NotificationChildrenContainer and NSSL.

Bug: 281628358
Test: `adb shell settings put global systemui/buffer/NotifRenderLog VERBOSE` and look for NotifRow in logcat
Change-Id: Id27cd7896573fbeb0a87ad04eb9af4a6e8d8dacf