pgstat: remove stats_temp_directory.

Andres Freund <andres@anarazel.de>

Commit: 6f0cf87872ab2fd4a81249ca9d6299b9b1a52277
Author: Andres Freund <andres@anarazel.de>
Date: 2022-04-07T04:29:46Z
Releases: 15.0
pgstat: remove stats_temp_directory.

With stats now being stored in shared memory, the GUC isn't needed
anymore. However, the pg_stat_tmp directory and PG_STAT_TMP_DIR define are
kept, as pg_stat_statements (and some out-of-core extensions) store data in
it.

Docs will be updated in a subsequent commit, together with the other pending
docs updates due to shared memory stats.

Author: Andres Freund <andres@anarazel.de>
Author: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Reviewed-By: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Discussion: https://postgr.es/m/20220330233550.eiwsbearu6xhuqwe@alap3.anarazel.de
Discussion: https://postgr.es/m/20220303021600.hs34ghqcw6zcokdh@alap3.anarazel.de

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