This should have been together with 674a4b1

Unlike the old DECam test dataset, the new test LSSTComCamSim dataset
does not have crosstalk. So, use another dataset type to test.

Also fix a time stamp missed in the previous commit.

The optimal value likely depends on the instrument and the
skymap choice.

Instead of determining the instrument's wcsFlipX here, it is more
robust to use its formatter, which knows its camera orientation
from its obs package.

This changes the APIs of _export_skymap_and_templates and
_export_refcats to take a lsst.sphgeom.Region directly.

Note that the centroid of the region is not the same of the
detector center, but it should not matter.

Because htm7 can be too coarse compared to the patch size, using
htm7 indices to search for templates may lead to preloading more
patches than necessary and wasting time. This feature of using
htm7 to search for overlapping templates is also about to be
deprecated and replaced by the arbitrary spatial region query in
Butler. The usage will be replaced when switching to the new
butler query system.

This is a preparation step before switching to the new butler query
system.

In the new query system, query_datasets takes one datasetType at a
time, while butler.registry.queryDatasets can take a list of dataset
types in the old system. So, we change to query (via _filter_datasets)
one type of calibs/refcats/templates at a time.

Currently we can preload more types of calibs/refcats/templates
than the actual pipelines really need. It's possible that some types
are not preloaded but it's okay. For now we allow _MissingDatasetError.

The new Butler query systems supports spatial-constraint query
via lsst.sphgeom.Region directly. With this change, we use it
in template and refcat search. This needs stack w_2024_38 or newer.

make_export.py uses _filter_datasets so it needs to adjust to the
new underlying API too.

Some unit tests were temporarily marked expectedFailure in 674a4b1.

Now that we switch to the new query system, make them work again.

The test repo was put together using middleware tools, which
intrinsically uses butler repo's visit-detector regions with its
padding from defineVisits config.

That padding config is not the same as the preload region padding
in prompt processing.

This explains the patch differences in template selection.