[test] Add test on Data link between 1d vectors

[alxbilger]

To make sure that a Data<sofa::type::vector<sofa::type::Vec1d>> can be converted to a Data<sofa::type::vector<SReal>>

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[bakpaul]

I understand that this conversion seems natural, but why is it needed and more over why should we make sure it is always the case ?

[alxbilger]

I need it in https://github.com/sofa-framework/sofa/pull/5122, where I make a link between a 1D position and a vector of reals (triangleData="@../constraintSpace/areaDoFs.position")