Alerting: decouple api models from domain\dto models: separate Provenance status + converters (#63594)

* move conversions of domain models to api models and reverse from definition package to api package

pkg/services/ngalert/api/compat_test.go

@@ -0,0 +1,37 @@
+package api
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/grafana/grafana/pkg/services/ngalert/api/tooling/definitions"
+)
+
+func TestToModel(t *testing.T) {
+	t.Run("if no rules are provided the rule field should be nil", func(t *testing.T) {
+		ruleGroup := definitions.AlertRuleGroup{
+			Title:     "123",
+			FolderUID: "123",
+			Interval:  10,
+		}
+		tm, err := AlertRuleGroupFromApi(ruleGroup)
+		require.NoError(t, err)
+		require.Nil(t, tm.Rules)
+	})
+	t.Run("if rules are provided the rule field should be not nil", func(t *testing.T) {
+		ruleGroup := definitions.AlertRuleGroup{
+			Title:     "123",
+			FolderUID: "123",
+			Interval:  10,
+			Rules: []definitions.ProvisionedAlertRule{
+				{
+					UID: "1",
+				},
+			},
+		}
+		tm, err := AlertRuleGroupFromApi(ruleGroup)
+		require.NoError(t, err)
+		require.Len(t, tm.Rules, 1)
+	})
+}