[Bug] MM2 should have its own default Strimzi Metrics configuration

[scholzj]

It seems that MM2 and Connect currently share the same default configuration for the Strimzi Metrics Reporter. That means that for example the Connect default metrics expose the MM2 connector metrics, which seems wrong:

    private static final List<String> DEFAULT_METRICS_ALLOW_LIST = List.of(
            ...
            "kafka_connect_mirror_mirrorcheckpointconnector.*",
            "kafka_connect_mirror_mirrorsourceconnector.*",
            ...
    );

This should be updated to have the correct configuration for each operand. The one with Connect and MM2 metrics for MM2 and one with Connect only for Connect.