Remove unnecessary PGDATABASE settings from TAP tests

Michael Paquier <michael@paquier.xyz>

Commit: 4b66d7b4e0b3bb55c04fe9466b428c24d7cb0980
Author: Michael Paquier <michael@paquier.xyz>
Date: 2024-01-03T01:28:05Z
Releases: 17.0
Remove unnecessary PGDATABASE settings from TAP tests

Some of the TAP tests have been historically setting the environment
variable PGDATABASE to 'postgres', which is not needed because
PostgreSQL::Test::Cluster already sets it when initialized.  This commit
removes these explicit setups.

Note that the dependency of cluster -a with PGDATABASE (from
1caef31d9e55) is still documented.

Author: Bharath Rupireddy
Discussion: https://postgr.es/m/CALj2ACXLAz5dW3ZP+Fec8g6jQMMmDyCVT+qdbye2h7QJJmhsdw@mail.gmail.com

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