test: migrate ExecutableReferenceTest 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 testCallMethodOfClassNotPresent
• Replaced junit 4 test annotation with junit 5 test annotation in testSuperClassInGetAllExecutables
• Replaced junit 4 test annotation with junit 5 test annotation in testGetAllExecutablesMethodForInterface
• Replaced junit 4 test annotation with junit 5 test annotation in testGetAllExecutablesMethodForClasses
• Replaced junit 4 test annotation with junit 5 test annotation in testCreateReferenceForAnonymousExecutable
• Replaced junit 4 test annotation with junit 5 test annotation in testInvokeEnumMethod
• Replaced junit 4 test annotation with junit 5 test annotation in testLambdaNoClasspath
• Replaced junit 4 test annotation with junit 5 test annotation in testHashcodeWorksWithReference
• Replaced junit 4 test annotation with junit 5 test annotation in testPbWithStream

AssertionsTransformation

• Transformed junit4 assert to junit 5 assertion in testCallMethodOfClassNotPresent
• Transformed junit4 assert to junit 5 assertion in testSuperClassInGetAllExecutables
• Transformed junit4 assert to junit 5 assertion in testGetAllExecutablesMethodForInterface
• Transformed junit4 assert to junit 5 assertion in testGetAllExecutablesMethodForClasses
• Transformed junit4 assert to junit 5 assertion in matches
• Transformed junit4 assert to junit 5 assertion in testInvokeEnumMethod
• Transformed junit4 assert to junit 5 assertion in testHashcodeWorksWithReference
• Transformed junit4 assert to junit 5 assertion in testPbWithStream