Cloudwatch: Deprecate cloudwatchNewRegionsHandler feature toggle and remove core imports from featuremgmt (#81310)

* Remove core imports from grafana/pkg/services/featuremgmt in CloudWatch

pkg/tsdb/cloudwatch/test_utils.go

@@ -2,6 +2,7 @@ package cloudwatch
 
 import (
 	"context"
+	"strings"
 
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/aws/request"
@@ -16,6 +17,7 @@ import (
 	"github.com/aws/aws-sdk-go/service/resourcegroupstaggingapi/resourcegroupstaggingapiiface"
 	"github.com/grafana/grafana-aws-sdk/pkg/awsds"
 	"github.com/grafana/grafana-plugin-sdk-go/backend"
+	"github.com/grafana/grafana-plugin-sdk-go/experimental/featuretoggles"
 	"github.com/grafana/grafana/pkg/setting"
 	"github.com/stretchr/testify/mock"
 )
@@ -270,3 +272,9 @@ func (e fakeAWSError) Code() string {
 func (e fakeAWSError) Message() string {
 	return e.message
 }
+
+func contextWithFeaturesEnabled(enabled ...string) context.Context {
+	featureString := strings.Join(enabled, ",")
+	cfg := backend.NewGrafanaCfg(map[string]string{featuretoggles.EnabledFeatures: featureString})
+	return backend.WithGrafanaConfig(context.Background(), cfg)
+}