Remove unused import and add comments

Removed unused 'strings' import and added comments for clarity.

Signed-off-by: Rahul Naskar <143400898+rahul810050@users.noreply.github.com>

Author: rahul810050

cmd/operator/controller/start.go

@@ -23,9 +23,10 @@ import (
 	"fmt"
 	"os"
 	"slices"
-	"strings"
 	"time"
 
+	// Import all Kubernetes client auth plugins (e.g. Azure, GCP, OIDC, etc.)
+	// to ensure that exec-entrypoint and run can make use of them.
 	_ "k8s.io/client-go/plugin/pkg/client/auth"
 	"k8s.io/client-go/rest"
 
@@ -62,8 +63,8 @@ import (
 	"github.com/kubeflow/spark-operator/v2/pkg/common"
 	operatorscheme "github.com/kubeflow/spark-operator/v2/pkg/scheme"
 	"github.com/kubeflow/spark-operator/v2/pkg/util"
+	// +kubebuilder:scaffold:imports
 )
-
 var (
 	logger = ctrl.Log.WithName("")
 )