[macOS] Disable FlutterEngineTest.BackgroundColor (#52341) This was re-enabled in https://github.com/flutter/flutter/issues/124677 after fixing leaks in https://github.com/flutter/engine/pull/50832. Since this test involves an NSWindow, there are separate fixes that should be landed to reduce flakes related to lack of NSWindow close calls in the tests. See related AppKit bug report filed at http://www.openradar.me/FB13291861. Issue: https://github.com/flutter/flutter/issues/145728 Related issue: https://github.com/flutter/flutter/issues/124677 [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
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