rcal-850 Addition of catalog step to mosaic pipeline

[ddavis-stsci]

Resolves RCAL-850

Closes #1256

This PR adds the source catalog step to run on the resampled image at the end of the mosaic pipeline to create the _cat.asdf _segm.asdf files.

Checklist

• [x] added entry in CHANGES.rst under the corresponding subsection
• [x] updated relevant tests
• [x] updated relevant documentation
• [x] updated relevant milestone(s)
• [x] added relevant label(s)
• [x] ran regression tests, post a link to the Jenkins job below. How to run regression tests on a PR https://plwishmaster.stsci.edu:8081/job/RT/job/Roman-Developers-Pull-Requests/813/

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 12.50000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 78.87%. Comparing base (f593a51) to head (b55791f).

Files	Patch %	Lines
romancal/pipeline/mosaic_pipeline.py	12.50%	7 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1266 +/- ## ========================================== - Coverage 78.92% 78.87% -0.05% ========================================== Files 117 117 Lines 8065 8071 +6 ========================================== + Hits 6365 6366 +1 - Misses 1700 1705 +5 ``` | [Flag](https://app.codecov.io/gh/spacetelescope/romancal/pull/1266/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=spacetelescope) | Coverage Δ | | *Carryforward flag | |---|---|---|---| | [nightly](https://app.codecov.io/gh/spacetelescope/romancal/pull/1266/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=spacetelescope) | `62.79% <ø> (ø)` | | Carriedforward from [f593a51](https://app.codecov.io/gh/spacetelescope/romancal/commit/f593a51435bab3719849a248bf50e25db1ec5dc6?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=spacetelescope) | *This pull request uses carry forward flags. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=spacetelescope) to find out more.

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