Revert "Add new 'preferred_name' attribute."

This change exposed a pre-existing issue with deserialization cycles
caused by a combination of attributes and template instantiations
violating the deserialization ordering restrictions; see PR48434 for
details.

A previous commit attempted to work around PR48434, but appears to have
only been a partial fix, and fixing this properly seems non-trivial.
Backing out for now to unblock things.

This reverts commit 98f76adf4e941738c0b9fe3b9965fa63603e9c89 and
commit a64c26a47a81b1b44e36d235ff3bc6a74a0bad9f.

GitOrigin-RevId: a1344779ab019a6bcd29842c1499343e15efbe87
5 files changed