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 100.00%. Comparing base (dede568) to head (de33a77).

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #20   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines            7         7           
=========================================
  Hits             7         7           

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