fix jump detection tests

[cshanahan1]

Small change in tests for jump detection. This along with spacetelescope/stcal#44 can close #6234

[codecov]

Codecov Report

Merging #6310 (9e56afa) into master (602b6c9) will decrease coverage by 0.40%.
The diff coverage is n/a.

❗ Current head 9e56afa differs from pull request most recent head 6d5da56. Consider uploading reports for the commit 6d5da56 to get more accurate results

@@            Coverage Diff             @@
##           master    #6310      +/-   ##
==========================================
- Coverage   77.70%   77.30%   -0.41%     
==========================================
  Files         408      408              
  Lines       34903    35040     +137     
==========================================
- Hits        27120    27086      -34     
- Misses       7783     7954     +171     

Flag	Coverage Δ		*Carryforward flag
nightly	77.59% <ø> (-0.12%)	⬇️	Carriedforward from 066f696
unit	56.39% <ø> (+0.04%)	⬆️

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
jwst/regtest/conftest.py	64.67% <0.00%> (-23.37%)	⬇️
jwst/extract_1d/extract.py	70.96% <0.00%> (-6.56%)	⬇️
jwst/rscd/rscd_step.py	72.41% <0.00%> (-3.45%)	⬇️
jwst/regtest/regtestdata.py	85.32% <0.00%> (-1.84%)	⬇️
jwst/datamodels/wcs_ref_models.py	76.86% <0.00%> (-0.05%)	⬇️
jwst/wfs_combine/wfs_combine_step.py	100.00% <0.00%> (ø)
jwst/associations/lib/rules_level2b.py	96.70% <0.00%> (ø)
jwst/datamodels/fringefreq.py
jwst/datamodels/residualfringe.py	100.00% <0.00%> (ø)
jwst/residual_fringe/residual_fringe_step.py	13.84% <0.00%> (+0.20%)	⬆️
... and 3 more

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[nden]

The installed package test is running for 2 hours now. Seems to be stuck.