[SofaSimulationCore] Clearer message when a linear solver is missing

[alxbilger]

[ERROR]   [DAGNode(Snake)] A linear solver is required, but has not been found. Add a linear solver to your scene to fix this issue. The list of available linear solver components is: [BTDLinearSolver, BlockJacobiPreconditioner, CGLinearSolver, CholeskySolver, JacobiPreconditioner, LULinearSolver, MinResLinearSolver, PrecomputedLinearSolver, PrecomputedWarpPreconditioner, SSORPreconditioner, SVDLinearSolver, ShewchukPCGLinearSolver, SparseCholeskySolver, SparseLDLSolver, SparseLUSolver, WarpPreconditioner].

instead of

[ERROR]   [DAGNode(Snake)] Requires a LinearSolver.

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Reviewers will merge this pull-request only if

• it builds with SUCCESS for all platforms on the CI.
• it does not generate new warnings.
• it does not generate new unit test failures.
• it does not generate new scene test failures.
• it does not break API compatibility.
• it is more than 1 week old (or has fast-merge label).

[guparan]

Thanks for this great UX improvement!

[alxbilger]

[ci-build][with-all-tests]

[damienmarchal]

Ready ? Then merge.