test: migrate VariableAccessTest to Junit 5

[MartinWitt]

#3919

The following has changed in the code:

Junit4 @test Annotation

• Replaced junit 4 test annotation with junit 5 test annotation in testVariableAccessDeclarationInAnonymousClass
• Replaced junit 4 test annotation with junit 5 test annotation in testDeclarationArray
• Replaced junit 4 test annotation with junit 5 test annotation in testParameterReferenceInConstructorNoClasspath
• Replaced junit 4 test annotation with junit 5 test annotation in testDeclarationOfVariableReference
• Replaced junit 4 test annotation with junit 5 test annotation in testDeclaringTypeOfALambdaReferencedByParameterReference
• Replaced junit 4 test annotation with junit 5 test annotation in testGetDeclarationAfterClone
• Replaced junit 4 test annotation with junit 5 test annotation in testReferences
• Replaced junit 4 test annotation with junit 5 test annotation in testReferencesInInitExpression
• Replaced junit 4 test annotation with junit 5 test annotation in testReferenceToLocalVariableDeclaredInLoop
• Replaced junit 4 test annotation with junit 5 test annotation in testMultipleDeclarationsOfLocalVariable
• Replaced junit 4 test annotation with junit 5 test annotation in testSuperAccess

AssertionsTransformation

• Transformed junit4 assert to junit 5 assertion in testVariableAccessDeclarationInAnonymousClass
• Transformed junit4 assert to junit 5 assertion in testDeclarationArray
• Transformed junit4 assert to junit 5 assertion in matches
• Transformed junit4 assert to junit 5 assertion in matches
• Transformed junit4 assert to junit 5 assertion in testGetDeclarationAfterClone
• Transformed junit4 assert to junit 5 assertion in testReferences
• Transformed junit4 assert to junit 5 assertion in testReferencesInInitExpression
• Transformed junit4 assert to junit 5 assertion in visitCtLocalVariableReference
• Transformed junit4 assert to junit 5 assertion in visitCtLocalVariableReference
• Transformed junit4 assert to junit 5 assertion in testSuperAccess