Prometheus: Use frontend package in Prometheus DS with a feature toggle (#84397)

* add feature toggle usePrometheusFrontendPackage

* add feature toggle logic to Prometheus module

* use config editor with package and remove configOverhaul feature toggle

* update betterer because we will be removing other files as we replace with files from @grafana/prometheus

* fix exemplar ds picker selector

* add more description to ts-ignore

* remove go.work.sum change

* copy go.work.sum from main

* update go.work.sum after talking with ismail

* put back the promlib entry

---------

Co-authored-by: ismail simsek <ismailsimsek09@gmail.com>

pkg/services/featuremgmt/registry.go

@@ -1174,6 +1174,13 @@ var (
 			HideFromDocs:      true,
 			HideFromAdminPage: true,
 		},
+		{
+			Name:         "usePrometheusFrontendPackage",
+			Description:  "Use the @grafana/prometheus frontend package in core Prometheus.",
+			Stage:        FeatureStageExperimental,
+			FrontendOnly: true,
+			Owner:        grafanaObservabilityMetricsSquad,
+		},
 	}
 )
 

pkg/services/featuremgmt/toggles_gen.csv

@@ -156,3 +156,4 @@ groupByVariable,experimental,@grafana/dashboards-squad,false,false,false
 betterPageScrolling,GA,@grafana/grafana-frontend-platform,false,false,true
 scopeFilters,experimental,@grafana/dashboards-squad,false,false,false
 ssoSettingsSAML,experimental,@grafana/identity-access-team,false,false,false
+usePrometheusFrontendPackage,experimental,@grafana/observability-metrics,false,false,true

pkg/services/featuremgmt/toggles_gen.go

@@ -634,4 +634,8 @@ const (
 	// FlagSsoSettingsSAML
 	// Use the new SSO Settings API to configure the SAML connector
 	FlagSsoSettingsSAML = "ssoSettingsSAML"
+
+	// FlagUsePrometheusFrontendPackage
+	// Use the @grafana/prometheus frontend package in core Prometheus.
+	FlagUsePrometheusFrontendPackage = "usePrometheusFrontendPackage"
 )