viable/strict/1791005820: [dynamo] Add operator.concat/iconcat mutation regression tests (#188966)

发生了什么

Fixes #116396 . operator.concat and operator.iconcat are already supported by the polyfills added in #175213 ( torch/_dynamo/polyfills/operator.py ) and covered by the existing test_operator_concat / test_operator_iconcat tests, so the BuiltinVariable entries from the earlier revision of this PR were unreachable and have been removed. This PR now adds regression tests for the behavior that matters: the functools.red…

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