WTI-2534: Added observer for the FailureMechanismContribution: - Changes in the norm should reflect in the selectable probabilities for the water level
WTI-2491: Incorporated comments review 4417: - Reintroduced RiskeerPluginHelper where it was removed to prevent views from being closed by changes in the FailurePaths state -- Adjusted affected tests
WTI-2491: Incorporated comments review 4417: - Adjusted RiskeerPluginHelper: close the views also properly for output views -- Adjusted compilation errors