Fix broken collate.icu.utf8 test in v12 branch.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 0ef9ac290ff3370f345fa08091c6586fecd8354f
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2024-11-10T20:45:34Z
Releases: 12.21
Fix broken collate.icu.utf8 test in v12 branch.

collate.icu.utf8.sql is not run by default before v13, and commits
9c4757491/46d9be5ef evidently didn't bother to test it, with
the completely predictable result that it was broken.
We didn't have enable_incremental_sort in v12, plus EXPLAIN makes
different table alias choices than later branches.

Per buildfarm member copperhead.

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