JP-3731: Update association path warning message.

[drlaw1558]

This PR addresses JP-3731, updating the log message warning about use of paths within association files.

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 60.84%. Comparing base (e0008ab) to head (3509828).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8752      +/-   ##
==========================================
+ Coverage   60.79%   60.84%   +0.05%     
==========================================
  Files         373      373              
  Lines       38683    38650      -33     
==========================================
  Hits        23516    23516              
+ Misses      15167    15134      -33     

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[melanieclarke]

Starting regression tests here:
https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/1696/

I can't imagine this would impact regtests, but just in case!

[melanieclarke]

This looks fine to me, pending a clean regtest result. Thanks!

[melanieclarke]

Regtest failures are all unrelated. I will merge when CI is complete.