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Avoid allocations in DGMulti parabolic `calc_boundary_flux!` (#2947)

* Avoid allocations in DGMulti parabolic boundary flux

Replace recursive first/Base.tail iteration over boundary NamedTuples with the same zip(keys, values) loop used by hyperbolic DGMulti (dg.jl). This removes heap allocations on rhs_parabolic! for dgmulti advection-diffusion setups.

Fixes https://github.com/trixi-framework/Trixi.jl/issues/2729

Made-with: Cursor

* reactive broken test

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Co-authored-by: Daniel Doehring <daniel.doehring@rwth-aachen.de>

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