Dashboard Controls: Fix schema transformation for link placement (#114630)

* fix: add missing transformation for scenes -> save model v2

* fix: link placement transformation on the backend between schemas

* fix: update the openapi spec in the tests

* tes: add tests for `transformSceneToSaveModelSchemaV2`

* tests: extend conversion_test.go to cover link placements

packages/grafana-schema/src/schema/dashboard/v2alpha1/types.spec.gen.ts

@@ -971,6 +971,8 @@ export interface DashboardLink {
 	includeVars: boolean;
 	// If true, includes current time range in the link as query params
 	keepTime: boolean;
+	// Placement can be used to display the link somewhere else on the dashboard other than above the visualisations.
+	placement?: "inControlsMenu";
 }
 
 export const defaultDashboardLink = (): DashboardLink => ({
@@ -983,6 +985,7 @@ export const defaultDashboardLink = (): DashboardLink => ({
 	targetBlank: false,
 	includeVars: false,
 	keepTime: false,
+	placement: DashboardLinkPlacement,
 });
 
 // Dashboard Link type. Accepted values are dashboards (to refer to another dashboard) and link (to refer to an external resource)
@@ -990,6 +993,10 @@ export type DashboardLinkType = "link" | "dashboards";
 
 export const defaultDashboardLinkType = (): DashboardLinkType => ("link");
 
+// Dashboard Link placement. Defines where the link should be displayed.
+// - "inControlsMenu" renders the link in bottom part of the dashboard controls dropdown menu
+export const DashboardLinkPlacement = "inControlsMenu";
+
 // Time configuration
 // It defines the default time config for the time picker, the refresh picker for the specific dashboard.
 export interface TimeSettingsSpec {