rcal-697 Update exposure pipeline to add tweakreg step

[ddavis-stsci]

Resolves RCAL-697

Closes #951

This PR addresses ...

Checklist

• added entry in CHANGES.rst under the corresponding subsection
• updated relevant tests
• updated relevant documentation
• updated relevant milestone(s)
• added relevant label(s)
• ran regression tests, post a link to the Jenkins job below. How to run regression tests on a PR
  Jenkins is down the local regression test passes

pytest --bigdata /Users/ddavis/src/Roman/romancal/romancal/regtest/ --basetemp=/Users/ddavis/src/Roman/develop/test/tmp_tc -k test_level2_grism_processing 2>&1 | tee test_pipeline_Oct27_2023_4.log

============================= test session starts ==============================
platform darwin -- Python 3.11.0, pytest-7.4.0, pluggy-1.2.0
rootdir: /Users/ddavis/src/Roman/romancal
configfile: pyproject.toml
plugins: remotedata-0.4.0, asdf-2.15.0, hypothesis-6.82.0, doctestplus-0.13.0, cov-4.1.0, filter-subpackage-0.1.2, mock-3.11.1, astropy-header-0.2.2, anyio-3.7.1, astropy-0.10.0, ci-watson-0.6.1, openfiles-0.5.0, env-0.8.2, arraydiff-0.5.0
collected 32 items / 31 deselected / 1 selected
../../../romancal/romancal/regtest/test_wfi_pipeline.py .                [100%]
=============================== warnings summary ===============================
romancal/regtest/test_wfi_pipeline.py::test_level2_grism_processing_pipeline
  /Users/ddavis/miniconda3/envs/rcal_dev/lib/python3.11/site-packages/asdf/asdf.py:352: AsdfWarning: File 'file:///Users/ddavis/src/Roman/develop/test/tmp_tc/test_level2_grism_processing_p0/r0000201001001001002_01101_0001_WFI01_uncal.asdf' was created with extension class 'asdf.extension.BuiltinExtension' (from package asdf==2.15.1), but older package (asdf==2.15.0) is installed.
    warnings.warn(msg, AsdfWarning)
romancal/regtest/test_wfi_pipeline.py::test_level2_grism_processing_pipeline
  /Users/ddavis/src/Roman/romancal/romancal/refpix/data.py:418: RuntimeWarning: invalid value encountered in divide
    kern = (cov / mask_conv).reshape(rows, columns)
-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html

========== 1 passed, 31 deselected, 2 warnings in 1233.11s (0:20:33) ===========

The run time warning is from refpix.

[schlafly]

Looks good to me!

[codecov]

Codecov Report

Attention: 21 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
romancal/pipeline/exposure_pipeline.py	37.28% <8.69%> (-3.46%)	⬇️

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