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`DGMulti` shock capturing part 2: `SBP` approximation types (#2942)

* changes related to cleanup of existing shock capturing

remove extra end

remove unnecessary comment

* add 3d shock capturing elixir

add 3d test

* formatting

* Adding shock capturing routines for SBP on Line/Quad elements

* add test for non-Gauss SBP shock capturing

* fix naming convention

* updating tests

Removing curved shock capturing test since we haven't implemented low order free-stream metrics

* update CI values with x86 run values

* update initial condition to avoid x86/aarch64 differences with CI vals

* Use weak C0 blast IC for DGMulti Euler shock capturing

Replace the polar-coordinate blast setup with a Cartesian weak C0 initial condition so we avoid floating-point trouble from polar evaluation and from sampling exactly on the discontinuity.

Update the GaussSBP and SBP regression L2/L∞ norms in test_dgmulti_2d.jl for elixir_euler_shockcapturing.jl to match the new IC.

Made-with: Cursor

* Apply suggestions from code review

Co-authored-by: Daniel Doehring <doehringd2@gmail.com>

* comments on 2 * f_ij and sparse operator column entries rows[j]

* fix formatting

* Update src/solvers/dgmulti/shock_capturing.jl

* Update examples/dgmulti_2d/elixir_euler_shockcapturing.jl

* Update src/solvers/dgmulti/shock_capturing.jl

* Update src/solvers/dgmulti/shock_capturing.jl

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Co-authored-by: Daniel Doehring <doehringd2@gmail.com>
Co-authored-by: Daniel Doehring <daniel.doehring@rwth-aachen.de>

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