Ban junit 4

[ppalaga]

Hopefully we can do what Quarkus does since at least 2.0:

        <dependency>
            <groupId>org.testcontainers</groupId>
            <artifactId>testcontainers</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>junit</groupId>
                    <artifactId>junit</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>io.quarkus</groupId>
            <artifactId>quarkus-junit4-mock</artifactId>
        </dependency>

plus we should ban junit:junit via enforcer plugin.