ciflow/torchtitan/194640: [AOTI][FlyDSL] Test composed packaged launchers (#194640)

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Summary: Pull Request resolved: #194640 Add MI350 end-to-end coverage for packaged FlyDSL launchers through the native AOTI package loader. Verify vector add packages the FlyDSL and MLIR runtime libraries, avoids clone/copy and Triton fallback code, and executes correctly on both the default and a non-default current stream. Add a flydsl_op case whose single launcher emits two device kernels with an explicit workspa…

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