added Parallelizable Attribute to many testcases; removed some unnecessary usings

VectoCore/VectoCoreTest/FileIO/JsonReadHybridTest.cs

VectoCore/VectoCoreTest/FileIO/JsonWriteTest.cs

.../Integration/CompletedBus/CompletedBusFactorMethodTest.cs

.../Integration/CompletedBus/CompletedBusSanityCheckTests.cs

...oCoreTest/Integration/Declaration/TestMaxMassInMUCycle.cs

...oCore/VectoCoreTest/Integration/DualFuel/DualFuelTests.cs

VectoCore/VectoCoreTest/Models/Declaration/BusFactoryTest.cs

...aAdapter/DeclarationAdapterCreateVocationalVehicleTest.cs

...laration/DataAdapter/DeclarationDataAdapterTest_Class2.cs

...laration/DataAdapter/DeclarationDataAdapterTest_Class5.cs

...laration/DataAdapter/DeclarationDataAdapterTest_Class9.cs

...s/Declaration/DeclarationSegmentComplete2AxleBusesTest.cs

...s/Declaration/DeclarationSegmentComplete3AxleBusesTest.cs

...s/Declaration/DeclarationSegmentComplete4AxleBusesTest.cs

...st/Models/Declaration/DeclarationSegmentHeavyBusesTest.cs

...Core/VectoCoreTest/Models/Declaration/ShiftPolygonTest.cs

...t/Models/Declaration/TestGenericBusPowertrainModelData.cs

...eTest/Models/EngineeringMode/EngineeringModeBusAuxTest.cs

...Core/VectoCoreTest/Models/Simulation/DrivingCycleTests.cs

...re/VectoCoreTest/Models/Simulation/ShiftStrategyV2Test.cs