Mark hvcat block matrix tests as broken on Julia 1.13+

[ChrisRackauckas-Claude]

Summary

• Mark two hvcat block matrix concatenation tests as @test_broken on Julia 1.13+
• On Julia 1.13.0-alpha2, the [a b; c d] syntax for ComponentArrays does not dispatch to the ComponentArrays.hvcat method but falls back to LinearAlgebra's method, causing axes to be lost

Problem

The CI failure on "Julia pre - All" shows:

Math: Test Failed at test/runtests.jl:675
  Expression: getaxes([ab_ab ab_cd; cd_ab cd_cd]) == (ABCD, ABCD)
   Evaluated: () == (Axis(a = 1, b = 2, c = 3, d = 4), Axis(a = 1, b = 2, c = 3, d = 4))

This is due to changed method dispatch behavior in Julia 1.13 where the ComponentArrays hvcat method is not being selected over LinearAlgebra's more general method.

Test plan

• Tests pass on Julia 1.12 (LTS and stable)
• Tests will pass on Julia 1.13+ with the affected tests marked as broken

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