Proposed fix for testcontainers#2045

When we use multiple JUnit5 extensions, the way to order them is via the @ExtendsWith({FirstExtension.class, SecondExtension.class}) annotation.
But TestcontainersExtension is not public so we can only use the @testcontainers annotion and we are not able to order the extension.

See the following documentation on JUnit5: https://junit.org/junit5/docs/current/user-guide/#extensions-registration-declarative