feat: remove resource discriminator (#2299)

Signed-off-by: Attila Mészáros <[email protected]>

Author: csviri

Diff for: operator-framework/src/test/java/io/javaoperatorsdk/operator/sample/multipledependentresourcewithdiscriminator/MultipleDependentResourceWithDiscriminatorReconciler.java

@@ -6,7 +6,6 @@
 import io.fabric8.kubernetes.api.model.ConfigMap;
 import io.javaoperatorsdk.operator.api.config.informer.InformerConfiguration;
 import io.javaoperatorsdk.operator.api.reconciler.*;
-import io.javaoperatorsdk.operator.processing.event.ResourceID;
 import io.javaoperatorsdk.operator.processing.event.source.EventSource;
 import io.javaoperatorsdk.operator.processing.event.source.informer.InformerEventSource;
 import io.javaoperatorsdk.operator.support.TestExecutionInfoProvider;