PG17 compatibility: add COLLPROVIDER_BUILTIN option and fix tests #7752
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In PG17 adds builtin C.UTF-8 locale option, we add it in the code to avoid "unknown collation provider" in vanilla tests.
Relevant PG commit:
postgres/postgres@f69319f
f69319f2f1fb16eda4b535bcccec90dff3a6795e
Also in PG17, colliculocale, daticulocale renamed to colllocale, datlocale
Here we fix the following tests to avoid alternative output
pg15 pg16 multi_mx_create_table multi_schema_support
Relevant PG commit:
postgres/postgres@f696c0c
f696c0cd5f299f1b51e214efc55a22a782cc175d
Note to reviewer: First three commits are for PG17 testing purposes. Only the last 2 commits will be merged. Also, I wasn't sure whether I should add tests here.