Fix missing needs_concrete_A dispatch for HYPREAlgorithm

[AJ0070]

HYPREAlgorithm directly subtypes SciMLLinearSolveAlgorithm, so needs_concrete_A(::HYPREAlgorithm) was undefined. Downstream solvers (NonlinearSolveBase, OrdinaryDiffEq) call this trait for any SciMLLinearSolveAlgorithm, causing a MethodError and (with the old solve(cache) ↔ solve(cache, cache.alg) chain) a stack overflow when HYPRE is used as linsolve (#277).

• ext/LinearSolveHYPREExt.jl: add needs_concrete_A(::HYPREAlgorithm) = true and update_tolerances_internal!.
• src/extension_algs.jl: fix docstring — Pl is a solve/init keyword, not a constructor kwarg.
• test/LinearSolveHYPRE/hypretests.jl: tests for the trait and update_tolerances!.

Checklist

• Appropriate tests were added
• Any code changes were done in a way that does not break public API
• All documentation related to code changes were updated
• The new code follows the contributor guidelines, in particular the SciML Style Guide and COLPRAC.
• Any new documentation only uses public API

Additional context

Fixes #277. The downstream path (needs_concrete_A → concrete W → LinearProblem → init → solve! → update A/b → solve!) and the full test/LinearSolveHYPRE/hypretests.jl suite pass.

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