Use format_type sibling in backend error messages, so the user sees

src/backend/catalog/heap.c

src/backend/catalog/pg_proc.c

src/backend/commands/indexcmds.c

src/backend/parser/parse_agg.c

src/backend/parser/parse_clause.c

src/backend/parser/parse_expr.c

src/backend/parser/parse_func.c

src/backend/parser/parse_node.c

src/backend/parser/parse_oper.c

src/backend/parser/parse_target.c

src/backend/utils/adt/format_type.c

src/include/utils/builtins.h

src/test/regress/expected/alter_table.out

src/test/regress/expected/foreign_key.out

src/test/regress/expected/horology.out

src/test/regress/expected/time.out