Rcal 803 Initial resampling to skycell in the hlp

[ddavis-stsci]

Resolves RCAL-803

Closes #1162

This PR adds the ability to use an association to resample the members to the output product based on a skycell definition.

Checklist

• added entry in CHANGES.rst under the corresponding subsection
• updated relevant tests
• [N/A] 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
  The regression tests at https://plwishmaster.stsci.edu:8081/job/RT/job/Roman-Developers-Pull-Requests/732/
  are passing.

[codecov]

Codecov Report

Attention: Patch coverage is 17.24138% with 48 lines in your changes are missing coverage. Please review.

Project coverage is 79.16%. Comparing base (b61e70b) to head (12825be).
Report is 3 commits behind head on main.

Files	Patch %	Lines
romancal/pipeline/highlevel_pipeline.py	17.24%	48 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1214      +/-   ##
==========================================
+ Coverage   79.05%   79.16%   +0.10%     
==========================================
  Files         116      116              
  Lines        7994     8045      +51     
==========================================
+ Hits         6320     6369      +49     
- Misses       1674     1676       +2     

Flag	Coverage Δ		*Carryforward flag
nightly	62.78% <ø> (ø)		Carriedforward from 72342b4

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[schlafly]

This looks good to me.

Some notes:

• I hadn't thought about this before, but it's a little ~interesting that we are doing outlier detection & sky matching using the full SCAs, but the projection using only the skycell area. For the outlier detection that's wasteful, but probably not horribly so. For the sky matching it produces different results, but probably different results in a mildly beneficial way. I think we should just document that behavior for now.
• I agree with the code comments that we'll probably want to refactor this to get resample to take a WCS directly rather than via a file.
• I think I had the impression that you wanted to add some associated regtest demonstrating the L3 pipeline on skycells?