Give e2e workload cluster config a unique name (#7455)

Before, workload clusters added through the multicluster constructor had
an already set config path that defaulted to the management cluster's
config file. This meand workload cluster operations overwrote the same
file.

test/framework/multicluster.go

@@ -2,6 +2,7 @@ package framework
 
 import (
 	"fmt"
+	"path/filepath"
 	"sync"
 	"testing"
 	"time"
@@ -31,6 +32,7 @@ func NewMulticlusterE2ETest(t *testing.T, managementCluster *ClusterE2ETest, wor
 	for _, c := range workloadClusters {
 		c.clusterFillers = append(c.clusterFillers, api.WithManagementCluster(managementCluster.ClusterName))
 		c.ClusterName = m.NewWorkloadClusterName()
+		c.ClusterConfigLocation = filepath.Join(managementCluster.ClusterConfigFolder, c.ClusterName+"-eks-a.yaml")
 		m.WithWorkloadClusters(c)
 	}