chore : Deprecating FeatureToggles.IsEnabledGlobally (#112885)

* add deprecation on featuremgmt.IsEnabledGlobally

* add nolint reason

* add reasonable deprecation message

* remove junk edits

* add more nolints

* addressing review comments

* Update pkg/services/featuremgmt/models.go

Co-authored-by: Dave Henderson <dave.henderson@grafana.com>

---------

Co-authored-by: Dave Henderson <dave.henderson@grafana.com>

pkg/middleware/request_metrics.go

@@ -57,6 +57,7 @@ func RequestMetrics(features featuremgmt.FeatureToggles, cfg *setting.Cfg, promR
 		Buckets:   sizeDefBuckets, // 100B ... ~1MB
 	}
 
+	//nolint:staticcheck // not yet migrated to OpenFeature
 	if features.IsEnabledGlobally(featuremgmt.FlagEnableNativeHTTPHistogram) {
 		// the recommended default value from the prom_client
 		// https://github.com/prometheus/client_golang/blob/main/prometheus/histogram.go#L411
@@ -70,6 +71,7 @@ func RequestMetrics(features featuremgmt.FeatureToggles, cfg *setting.Cfg, promR
 		reqDurationOptions.NativeHistogramMinResetDuration = time.Hour
 		reqSizeOptions.NativeHistogramMinResetDuration = time.Hour
 
+		//nolint:staticcheck // not yet migrated to OpenFeature
 		if features.IsEnabledGlobally(featuremgmt.FlagDisableClassicHTTPHistogram) {
 			// setting Buckets to nil with native options set means the classic
 			// histogram will no longer be exposed - this can be a good way to