fix: kubeconfig state will not be removed if the cluster does not exists anymore (#659)

* fix: kubeconfig state is not removed if the cluster no longer exists and kubeconfig can't be found (status code 404)

Author: marceljk

stackit/internal/services/ske/kubeconfig/resource.go

@@ -3,6 +3,7 @@ package ske
 import (
 	"context"
 	"fmt"
+	"net/http"
 	"strconv"
 	"strings"
 	"time"
@@ -23,6 +24,7 @@ import (
 	"github.com/hashicorp/terraform-plugin-framework/resource/schema/stringplanmodifier"
 	"github.com/hashicorp/terraform-plugin-framework/types"
 	"github.com/stackitcloud/stackit-sdk-go/core/config"
+	"github.com/stackitcloud/stackit-sdk-go/core/oapierror"
 	"github.com/stackitcloud/stackit-sdk-go/core/utils"
 	"github.com/stackitcloud/stackit-sdk-go/services/ske"
 )
@@ -259,6 +261,11 @@ func (r *kubeconfigResource) Read(ctx context.Context, req resource.ReadRequest,
 
 	cluster, err := r.client.GetClusterExecute(ctx, projectId, clusterName)
 	if err != nil {
+		oapiErr, ok := err.(*oapierror.GenericOpenAPIError) //nolint:errorlint //complaining that error.As should be used to catch wrapped errors, but this error should not be wrapped
+		if ok && oapiErr.StatusCode == http.StatusNotFound {
+			resp.State.RemoveResource(ctx)
+			return
+		}
 		core.LogAndAddError(ctx, &resp.Diagnostics, "Error reading kubeconfig", fmt.Sprintf("Could not get cluster(%s): %v", clusterName, err))
 		return
 	}