Drop test view when done with it.

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

Commit: 71a75626d5271f2bcdbdc43b8c13065c4634fd9f
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2023-02-28T01:27:48Z
Releases: 16.0
Drop test view when done with it.

The view just added by commit 53fe7e6cb decompiles differently
in v15 than HEAD (presumably as a consequence of 47bb9db75).
That causes failures in cross-version upgrade testing.

We could teach AdjustUpgrade.pm to compensate for that, but it
seems less painful to just drop the view after we're done with it.

Per buildfarm.

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