Work around cross-version-upgrade issues created by commit 9e38c2bb5.

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

Commit: 5ce51f8280d3e2a59dbcd93c9d8244e3bf96944d
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2020-11-10T23:32:36Z
Releases: 12.6
Work around cross-version-upgrade issues created by commit 9e38c2bb5.

Summarily changing the STYPE of regression-test aggregates that
depend on array_append or array_cat is an issue for the buildfarm's
cross-version-upgrade tests, because those aggregates (as defined
in the back branches) now won't load into HEAD.  Although this seems
like only a minimal risk for genuine user-defined aggregates, we
need to do something for the buildfarm.  Hence, adjust the aggregate
definitions, in both HEAD and the back branches.

Discussion: https://postgr.es/m/1401824.1604537031@sss.pgh.pa.us
Discussion: https://postgr.es/m/E1kaQ2c-0005lx-Eg@gemulon.postgresql.org

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