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Raise WarpOperationError (new) if ChunkAndWarpMulti/Image fail (#2305)

* Raise WarpOperationError (new) if ChunkAndWarpMulti/Image fail

We've been hiding these errors and allowing chunks of a warp
operation to pass with no data copied to the output.

Note that the error message isn't very detailed. In a lot of
cases it's a generic "TIFF read block error" and doesn't surface
root causes like server errors.

* Temporarily home in on one test

* Make 503 more predictable

The exact request range varies a little bit with GDAL version

* Skip test on pythons < 3.7

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