JP-3164: Removing tests that are already handled in STCAL or are unneeded.

[kmacdonald-stsci]

Resolves JP-3164

Closes #

This PR addresses a partial resolution of JP-3164 for ramp fitting CI tests. There were skipped tests in JWST that are already handled in STCAL, so they are unneeded duplicates.

Checklist for maintainers

• added entry in CHANGES.rst within the relevant release section
• updated or added relevant tests
• updated relevant documentation
• added relevant milestone
• added relevant label(s)
• ran regression tests, post a link to the Jenkins job below.
  How to run regression tests on a PR
• Make sure the JIRA ticket is resolved properly

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.08 ⚠️

Comparison is base (d4f3985) 77.52% compared to head (61e3563) 77.44%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7530      +/-   ##
==========================================
- Coverage   77.52%   77.44%   -0.08%     
==========================================
  Files         452      452              
  Lines       36232    36346     +114     
==========================================
+ Hits        28088    28148      +60     
- Misses       8144     8198      +54     

Flag	Coverage Δ		*Carryforward flag
nightly	77.53% <ø> (ø)		Carriedforward from d4f3985

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

see 3 files with indirect coverage changes

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