Use ICU by default at initdb time.

Jeff Davis <jdavis@postgresql.org>

Commit: 27b62377b47f9e7bf58613608bc718c86ea91e91
Author: Jeff Davis <jdavis@postgresql.org>
Date: 2023-03-09T18:52:41Z
Releases: 16.0
Use ICU by default at initdb time.

If the ICU locale is not specified, initialize the default collator
and retrieve the locale name from that.

Discussion: https://postgr.es/m/510d284759f6e943ce15096167760b2edcb2e700.camel@j-davis.com
Reviewed-by: Peter Eisentraut

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