Connecting ClosingStructureCalculationActivity with relevant services: - Introduced ClosingStructuresHelper to retrieve the FailureMechanismSection for the calculation (exact copy as its HeightStructure equivalent) - Introduced ClosingStructureDataSynchronizationService for clearing data (exact copy as its HeightStructure equivalent) - Extended TestClosingStructure: location and name can be given as constructor parameters - Extended ClosingStructuresCalculationActivity Related to Issue [WTI-554]