Re: #17526 ## Summary Add integration tests for Python Semantic Syntax for `InvalidStarExpression`, `DuplicateMatchKey`, and `DuplicateMatchClassAttribute`. ## Note - Red knot integration tests for `DuplicateMatchKey` exist already in line 89-101. <!-- What's the purpose of the change? What does it do, and why? --> ## Test Plan This is a test. <!-- How was it tested? -->