[PROJ] included tests and grids

[Even Rouault]

> So it would be nice if either the tests expected what seems to be the
> standard set of extra grids (i.e., what is listed at
> https://proj.org/download.html under "Current Release"), or somehow
> avoided reading things that aren't part of base.

https://github.com/OSGeo/PROJ/pull/1822 should fix this issue

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