Preserve fallback platform in exec/host transition. Previously the exec/host transition would set the fallback target platform back to its default whereas the --target_platform_fallback flag's semantics were meant to apply everywhere the platform_mapping does not get used. This change ensures the fallback uses the value of the passed flag in all instances (unless explicitly reset by a transition). RELNOTES: --target_platform_fallback now also applies to exec/host configurations PiperOrigin-RevId: 277557685
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