[compiler] Pass through unmodified props spread when inlining jsx #30995
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…sx (#30996) Based on #30995 ([rendered diff](https://github.com/jackpope/react/compare/inline-jsx-2...jackpope:react:inline-jsx-3?expand=1)) ____ Some apps still use `react.element` symbols. Not only do we want to test there but we also want to be able to upgrade those sites to `react.transitional.element` without blocking on the compiler (we can change the symbol feature flag and compiler config at the same time). The compiler runtime uses `react.transitional.element`, so the snap fixture will fail if we change the default here. However I confirmed that commenting out the fixture entrypoint and running snap with `react.element` will update the fixture symbols as expected.
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If JSX receives a props spread without additional attributes (besides
refandkey), we can pass the spread object as a property directly to avoid the extra object copy.