[3.10] gh-96002: Add functional test for Argument Clinic (GH-96178) (#100232)

(cherry picked from commit c450c8c)

Co-authored-by: Kumar Aditya <[email protected]>
Co-authored-by: Erlend E. Aasland <[email protected]>

Author: 3 people

Lib/test/test_clinic.py

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+Add functional test for Argument Clinic.