Define PG_TBLSPC_DIR for path pg_tblspc/ in data folder

Michael Paquier <michael@paquier.xyz>

Commit: c7cd2d6ed082a4638172acece33ed6f36da96263
Author: Michael Paquier <michael@paquier.xyz>
Date: 2024-09-03T00:11:54Z
Releases: 18.0
Define PG_TBLSPC_DIR for path pg_tblspc/ in data folder

Similarly to 2065ddf5e34c, this introduces a define for "pg_tblspc".
This makes the style more consistent with the existing PG_STAT_TMP_DIR,
for example.

There is a difference with the other cases with the introduction of
PG_TBLSPC_DIR_SLASH, required in two places for recovery and backups.

Author: Bertrand Drouvot
Reviewed-by: Ashutosh Bapat, Álvaro Herrera, Yugo Nagata, Michael
Paquier
Discussion: https://postgr.es/m/ZryVvjqS9SnV1GPP@ip-10-97-1-34.eu-west-3.compute.internal

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