Remove s3_utils module

[WilliamJamieson]

The s3_utils module is no longer needed, see spacetelescope/stpipe#91 for details. This PR removes that module and cleans all the usages of s3_utils from stdatamodels.

Checklist

• added entry in CHANGES.rst (either in Bug Fixes or Changes to API)
• updated relevant tests
• updated relevant documentation
• updated relevant milestone(s)
• added relevant label(s)

[WilliamJamieson]

The JWST failure is expected until spacetelescope/jwst#7542 is merged.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.25 ⚠️

Comparison is base (38e0edb) 65.22% compared to head (c6c00a9) 64.98%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #154      +/-   ##
==========================================
- Coverage   65.22%   64.98%   -0.25%     
==========================================
  Files         101       99       -2     
  Lines        5450     5377      -73     
==========================================
- Hits         3555     3494      -61     
+ Misses       1895     1883      -12     

Impacted Files	Coverage Δ
src/stdatamodels/jwst/datamodels/conftest.py	100.00% <ø> (ø)
src/stdatamodels/jwst/datamodels/util.py	77.54% <100.00%> (-0.47%)	⬇️
src/stdatamodels/model_base.py	91.11% <100.00%> (-0.14%)	⬇️

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[zacharyburnett]

looks like romancal tests will also have to be changed: https://github.com/spacetelescope/romancal/actions/runs/4723206177/jobs/8378998152#step:10:121

[WilliamJamieson]

looks like romancal tests will also have to be changed: spacetelescope/romancal/actions/runs/4723206177/jobs/8378998152#step:10:121

This has already been done: spacetelescope/romancal#676