refactor msa fail/nofail and association duplicate tests to not use caplog

[braingram]

The tests updated in this PR randomly fail (likely due to our complex logging and the pytest caplog fixture only using the root logger).

This PR removes the caplog fixture (from only these tests) and replaces it with a monkeypatch of the logger that emits the checked message.

Regression tests running (with jwst_1242.pmap since the new context is causing spec2 failures):
https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/1581/
show 0 failures.

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 59.56%. Comparing base (d02ac25) to head (ccf871a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8628   +/-   ##
=======================================
  Coverage   59.56%   59.56%           
=======================================
  Files         391      391           
  Lines       39285    39285           
=======================================
  Hits        23402    23402           
  Misses      15883    15883           

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[melanieclarke]

This looks good to me - thanks for addressing these tests, and for providing a general way to check for a specific log message.

[braingram]

Thanks! 🤞 the random failures go away for good.