[Telephony Debug Menu] Remove NeighboringCellInfo

This CL removes the long-obsolete NeighboringCellInfo.
From a debug perspective, this info is a subset of the
other info already present, so it just adds clutter
without adding any value.

Bug: 78791811
Test: manual
Change-Id: Iaf275f81e276f63bdd9651ac60a5485bf5bdf160