Add tests for date_part of epoch near upper bound of timestamp range

Peter Eisentraut <peter@eisentraut.org>

Commit: 6131ffc43ff3d2f566e93f017e56a09e4e717318
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2021-03-30T20:05:18Z
Releases: 14.0
Add tests for date_part of epoch near upper bound of timestamp range

This exercises a special case in the implementations of
date_part('epoch', timestamp[tz]) that was previously not tested.

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