remove name_format usage in wfs_combine

[braingram]

This PR replaces usage of name_format in wfs_combine with make_output_path. The resulting filenames saved by the step are the same (as is tested in the test_nircam_wfs_image regression test). This PR removes the only use of name_format to allow its removal in stpipe to work towards simplifying the file naming code.

Regression tests show only unrelated errors and no failures of test_nircam_wfs_image.
https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/1502/

Checklist for PR authors (skip items if you don't have permissions or they are not applicable)

• 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
• All comments are resolved
• Make sure the JIRA ticket is resolved properly

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 58.02%. Comparing base (4179c09) to head (b7e0b10).
Report is 326 commits behind head on master.

Files with missing lines	Patch %	Lines
jwst/wfs_combine/wfs_combine_step.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8539      +/-   ##
==========================================
+ Coverage   57.97%   58.02%   +0.04%     
==========================================
  Files         387      388       +1     
  Lines       38830    38977     +147     
==========================================
+ Hits        22513    22617     +104     
- Misses      16317    16360      +43     

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