Prometheus: Add support for cloud partners Prometheus data sources (#103482)

* wip

* Add prom flavor support for data source variables and export/import dashboards (#103321)

* add dashboard and data source var selection

* use match plugin id instead

* use updated matchpluginid

* formatting

* cleanup

* regex anchor

* update error msg

* Alerting: Clean up prometheus-flavored types and functions (#103703)

* clean up types and utility functions for dealing with
prometheus-flavored data sources

* Refactor alerting datasource types to use constants as source of truth

* Alerting: Clean up prometheus-flavored types and functions on the bac… (#103716)

Alerting: Clean up prometheus-flavored types and functions on the backend

* add matchPluginId tests

* Update matchPluginId func to bidirectional (#103746)

* update matchpluginid func to bidirectional

* lint

* formatting

* use actual isSupportedExternalRulesSourceType in test

* add tests in datasource_srv

* betterer

* remove type assertion

* remove unnecessary case

* use satisifies to not have to convert tuple to an array of string

* add prometheus_flavor test

---------

Co-authored-by: Andrew Hackmann <5140848+bossinc@users.noreply.github.com>
Co-authored-by: Gilles De Mey <gilles.de.mey@gmail.com>
Co-authored-by: Alexander Akhmetov <me@alx.cx>

pkg/services/datasources/service/datasource.go

@@ -922,7 +922,7 @@ func awsServiceNamespace(dsType string, jsonData *simplejson.Json) string {
 		} else {
 			return "es"
 		}
-	case datasources.DS_PROMETHEUS, datasources.DS_ALERTMANAGER:
+	case datasources.DS_PROMETHEUS, datasources.DS_AMAZON_PROMETHEUS, datasources.DS_ALERTMANAGER:
 		return "aps"
 	default:
 		panic(fmt.Sprintf("Unsupported datasource %q", dsType))