fix: Make AbstractOperatorExtension use the kubernetesClient if the infrastructureKubernetesClient is not set

Signed-off-by: xstefank <xstefank122@gmail.com>

Author: xstefank

operator-framework-junit5/src/main/java/io/javaoperatorsdk/operator/junit/AbstractOperatorExtension.java

@@ -78,7 +78,7 @@ protected AbstractOperatorExtension(
     this.infrastructureKubernetesClient =
         infrastructureKubernetesClient != null
             ? infrastructureKubernetesClient
-            : new KubernetesClientBuilder().build();
+            : kubernetesClient != null ? kubernetesClient : new KubernetesClientBuilder().build();
     this.kubernetesClient =
         kubernetesClient != null ? kubernetesClient : this.infrastructureKubernetesClient;
     this.infrastructure = infrastructure;