Detach a voltage level from 2 lines (line split reverse action)

[FranckLecuyer]

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[miovd]

About the naming: I think the clearest name from a user's viewpoint would be something like RevertConnectVoltageLevelOnLine for a user to understand it is the reverse action even if it is not a really nice name.

[miovd]

About the detached voltage level: I think you can directly delete it in any case (to be seen with @geofjamg and the GridSuite PO to check), it would be simpler to understand.

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