[3.12] bpo-46128: Strip IsolatedAsyncioTestCase frames from reported stacktraces (GH-30196) (#126771)

bpo-46128: Strip IsolatedAsyncioTestCase frames from reported stacktraces (GH-30196)

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(cherry picked from commit 2e39d77ddeb51505d65fd54ccfcd72615c6b1927)

Co-authored-by: Andrew Svetlov <andrew.svetlov@gmail.com>
Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>
Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>