Fix tracking of temp table relation extensions as writes

Karina figured out that I (Andres) confused BufferUsage.temp_blks_written with
BufferUsage.local_blks_written in fcdda1e4b5.

Tests in core PG can't easily test this, as BufferUsage is just used for
EXPLAIN (ANALYZE, BUFFERS) and pg_stat_statements. Thus this commit adds tests
for this to pg_stat_statements.

Reported-by: Karina Litskevich <litskevichkar...@gmail.com>
Author: Karina Litskevich <litskevichkar...@gmail.com>
Author: Andres Freund <and...@anarazel.de>
Discussion: 
https://postgr.es/m/cacit8ibxxa6+0amgikbefhm8b84xdqvo6d0qfd1pq1s8zps...@mail.gmail.com
Backpatch: 16-, where fcdda1e4b5 was merged

Branch
------
REL_16_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/c4758649b4db7d0c4b681985d24cc3e1e938047d

Modified Files
--------------
contrib/pg_stat_statements/expected/dml.out | 27 +++++++++++++++++++++++++++
contrib/pg_stat_statements/sql/dml.sql      | 19 +++++++++++++++++++
src/backend/storage/buffer/localbuf.c       |  2 +-
3 files changed, 47 insertions(+), 1 deletion(-)

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