Skip quality tools in downgrade tests

[Krastanov-agent]

Summary

• set the shared QUANTUMSAVORY_DOWNGRADE_TEST flag in downgrade CI
• exclude applicable Aqua and doctest checks only from the minimum-dependency run
• preserve ordinary tests and the existing dedicated or opt-in JET path
• leave the shared downgrade action inputs unchanged

Validation

• parsed the changed Julia test entry point
• parsed the workflow YAML
• ran git diff --check
• hosted CI provides the locked minimum-version integration test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 33.18%. Comparing base (612a113) to head (1171b54).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #91      +/-   ##
==========================================
+ Coverage   32.95%   33.18%   +0.22%     
==========================================
  Files          15       15              
  Lines         443      443              
==========================================
+ Hits          146      147       +1     
+ Misses        297      296       -1     

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