use stpipe.crds_client.reference_uri_to_cache_path

[braingram]

instead off Step.reference_uri_to_cache_path to allow it's removal in stpipe

Regression tests: https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/1509/
show only unrelated failures (matching those for https://plwishmaster.stsci.edu:8081/blue/organizations/jenkins/RT%2FJWST-Developers-Pull-Requests/detail/JWST-Developers-Pull-Requests/1508/pipeline

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

All modified and coverable lines are covered by tests ✅

Project coverage is 58.52%. Comparing base (b7e0b10) to head (4d19b45).
Report is 324 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8542      +/-   ##
==========================================
+ Coverage   58.02%   58.52%   +0.50%     
==========================================
  Files         388      388              
  Lines       38977    38957      -20     
==========================================
+ Hits        22617    22801     +184     
+ Misses      16360    16156     -204     

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[hbushouse]

Looks OK to me.