JP-3533 Update emicorr to run on FAST mode MIRI data

[penaguerrero]

Resolves JP-3533

Closes #8264

This PR addresses the behavior of the emicorr step. Previously it would run always for all MIRI data. The MIRI team requested it is skipped when no reference file is found and to add a parameter to allow the user to run the step for given frequencies with an on-the-fly generated reference file.

Checklist for maintainers

• [x] added entry in CHANGES.rst within the relevant release section
• [x] updated or added relevant tests
• [x] updated relevant documentation
• [x] added relevant milestone
• [x] 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[bot]]

Codecov Report

Attention: Patch coverage is 56.92308% with 28 lines in your changes are missing coverage. Please review.

Project coverage is 75.27%. Comparing base (2fb073e) to head (41afdb6). Report is 1 commits behind head on master.

Files	Patch %	Lines
jwst/emicorr/emicorr_step.py	0.00%	18 Missing :warning:
jwst/emicorr/emicorr.py	78.72%	10 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8270      +/-   ##
==========================================
- Coverage   75.31%   75.27%   -0.04%     
==========================================
  Files         474      474              
  Lines       38965    38971       +6     
==========================================
- Hits        29345    29335      -10     
- Misses       9620     9636      +16     

Flag	Coverage Δ		*Carryforward flag
nightly	77.33% <ø> (ø)		Carriedforward from 9e17fd4

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[hbushouse]

@penaguerrero Is this still WIP or is it ready for review?

[penaguerrero]

From my side it is ready but I was waiting to hear confirmation from Misty that it is indeed what they want.

[hbushouse]

Regression test run?

[penaguerrero]

regression test: https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/1308/