Migrate tests to JUnit 5

[vlsi]

This PR refactors the existing tests to JUnit 5.

Fixes #970
This is an alternative to #10285

The major migration was made with IDEA's "migrate JUnit 4 to 5", then I replaced @RunWith(Parameterized.class) with @ParameterizedClass.

There are still some leftovers:

• for unknown reasons, JUnit 5 forces @Nested classes to be non-static: Can @Nested class be non-static? junit-team/junit-framework#4613
• some of the classes still use @Rule public MockTestcontainersConfigurationRule
• there is one @RunWith(MockitoJUnitRunner.class)
• there are two @RunWith(BlockJUnit4ClassRunner.class)
• there is one @RunWith(Suite.class)
• there is one @RunWith(Enclosed.class)
• there is on @RunWith(Cucumber.class)
• the documentation still refers to junit4 patterns