pgsql: Add a test for UCS_BASIC collation

Add a test for UCS_BASIC collation

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/012ee842590d7bb56f250c15e00a8611ba0ae1da

Modified Files
--------------
src/test/regress/expected/collate.icu.utf8.out | 10 ++++++++++
src/test/regress/expected/collate.linux.utf8.out | 10 ++++++++++
src/test/regress/sql/collate.icu.utf8.sql | 5 +++++
src/test/regress/sql/collate.linux.utf8.sql | 5 +++++
4 files changed, 30 insertions(+)