test: migrate TestCtRole 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 testGetCtRoleByName
• Replaced junit 4 test annotation with junit 5 test annotation in testCtRoleGetSubRolesNotNull
• Replaced junit 4 test annotation with junit 5 test annotation in testCtRoleSubRoleMatchesWithSuperRole
• Replaced junit 4 test annotation with junit 5 test annotation in testCtRoleGetSubRole
• Replaced junit 4 test annotation with junit 5 test annotation in testCtRoleGetSubRoleFailsOnOthers
• Replaced junit 4 test annotation with junit 5 test annotation in testCtRoleGetSubRoleFailsOnNull

AssertionsTransformation

• Transformed junit4 assert to junit 5 assertion in testGetCtRoleByName
• Transformed junit4 assert to junit 5 assertion in testCtRoleGetSubRolesNotNull
• Transformed junit4 assert to junit 5 assertion in testCtRoleSubRoleMatchesWithSuperRole
• Transformed junit4 assert to junit 5 assertion in testCtRoleGetSubRole
• Transformed junit4 assert to junit 5 assertion in testCtRoleGetSubRoleFailsOnOthers
• Transformed junit4 assert to junit 5 assertion in testCtRoleGetSubRoleFailsOnNull