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
• [x] updated or added relevant tests
• [ ] updated relevant documentation
• [x] added relevant milestone
• [x] added relevant label(s)
• [x] 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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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