Mark slow tests as slow

[stscijirahubjdat]

Issue JDAT-4826 was created on JIRA by Pey-Lian Lim:

At the time of writing, these are the top 10 slowest tests (without the flag --run-slow). I propose we mark any test function longer than 5s with @⁣pytest.mark.slow so they do not run unless --run-slow is explicitly provided. Either that or refactor test or functional code to make the affected tests faster.

Motivation: Make local run less painful with faster turnaround time for debugging.

$ pytest --remote-data --pyargs jdaviz -vvv --durations=10
...
================================================= slowest 10 durations =================================================
331.60s call     jdaviz/core/tests/test_autoconfig.py::test_launcher
60.56s call     jdaviz/configs/cubeviz/plugins/spectral_extraction/tests/test_spectral_extraction.py::test_spectral_extraction_scientific_validation[4.85-aperture1-0.01-mast:jwst/product/jw01050-o003_t005_miri_ch1-shortmediumlong_s3d.fits-https://archive.stsci.edu/hlsps/reference-atlases/cdbs/current_calspec/hd159222_mod_007.fits]
44.01s call     jdaviz/configs/default/plugins/data_quality/tests/test_data_quality.py::test_cubeviz_layer_visibility_bug
42.13s call     jdaviz/configs/default/plugins/data_quality/tests/test_data_quality.py::test_data_quality_plugin
39.51s call     jdaviz/configs/cubeviz/plugins/spectral_extraction/tests/test_spectral_extraction.py::test_spectral_extraction_scientific_validation[4.85-aperture0-1e-05-mast:jwst/product/jw01524-o003_t002_miri_ch1-shortmediumlong_s3d.fits-https://archive.stsci.edu/hlsps/reference-atlases/cdbs/current_calspec/delumi_mod_005.fits]
20.04s call     jdaviz/configs/cubeviz/plugins/moment_maps/tests/test_moment_maps.py::test_momentmap_nirspec_prism
7.61s call     jdaviz/configs/mosviz/tests/test_parsers.py::test_nirspec_level2_parser
2.82s call     jdaviz/configs/default/plugins/data_quality/tests/test_data_quality.py::test_data_quality_plugin_hst_wfc3
2.77s call     jdaviz/configs/specviz2d/plugins/spectral_extraction/tests/test_spectral_extraction.py::test_horne_extract_self_profile
2.68s setup    jdaviz/configs/imviz/tests/test_simple_aper_phot.py::TestAdvancedAperPhot::test_sky_background[Subset 2-12.269274711608887-gauss100_fits_wcs_block_reduced[PRIMARY,1]-4]