JP-3223: Extract_2d 'slit_name' parameter fails for NRS_MSASPEC slits

[penaguerrero]

Resolves JP-3223

Closes #

This PR addresses potential break in a future datamodel, where the slit name for an MSA slitlet is not an integer.

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

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (00110b3) 75.94% compared to head (563dd7f) 75.95%.

❗ Current head 563dd7f differs from pull request most recent head 1caf2d0. Consider uploading reports for the commit 1caf2d0 to get more accurate results

Files	Patch %	Lines
jwst/extract_2d/nirspec.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8108   +/-   ##
=======================================
  Coverage   75.94%   75.95%           
=======================================
  Files         460      460           
  Lines       37629    37626    -3     
=======================================
  Hits        28577    28577           
+ Misses       9052     9049    -3     

Flag	Coverage Δ		*Carryforward flag
nightly	77.37% <ø> (ø)		Carriedforward from f13f8f5

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[hbushouse]

Please run regtests in JWST-Developers-Pull-Requests

[penaguerrero]

regtests ran, results at https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/1080/

failures appear unrelated to this PR's changes

[hbushouse]

regtests ran, results at https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/1080/

failures appear unrelated to this PR's changes

Agreed. Appears to be due to new NIRSpec flat-field ref files just delivered to Ops.