[Core] Add topology subset indices test

[bakpaul]

During my Way of the Cross of fusing StiffSpring and its parent, I saw that the topological change of removing points didn't work as planned for topologySubsetIndices when there is multiple occurrence of the same element in the data.

I've fixed that and added tests.

One question is remaining though : here I kept the original mechanism using a swap of the deleted element and the last one. This is efficient in term of memory but it has the side effect of changing the indices order in the data. --> My question is, is that what we want ? Do we prefer memory/time efficiency over order coherency for this data ? Is it logical to get a random order of the vector out of a simple topological change ? This answer will change a bit the way I'll finish the refactoring in https://github.com/sofa-framework/sofa/pull/4649

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