Data Connections: Create a new top-level page (#50018)

* Feature Flags: introduce a flag for enabling the Data Connections page

* Feature Flags: generate schemas

* Navigation: add navigation weight for the Data Connections page

* NavLink: add a comment pointing out where icon names can be looked up

* NavTree: add a new page called Data Connections

* fix(Api): prefix the navigation IDs with the parent ("data-connections")

* feat(Frontend): add a basic page with four tabs

* feat(Plugins): add a hook for importing an app plugin

* feat(Plugins): add a component for loading app plugins anywhere

* feat(Data Connections): load the cloud-onboarding app under the "Cloud onboarding" tab

* feat(Data Connections): generate a proper nav model to highlight active tabs

* test(Data Connections): add tests

* refactor(Data Connections): update temporary text content

This is only used as a placeholder until the tabs are under development.

* refactor(Data Cnnnections): move /pages to /tabs

* refactor(Data Connections): remove the `types.ts` file as it is not referenced by any module

* feat(Data Connections): only register routes if feature is enabled

packages/grafana-data/src/types/featureToggles.gen.ts

@@ -59,4 +59,5 @@ export interface FeatureToggles {
   canvasPanelNesting?: boolean;
   cloudMonitoringExperimentalUI?: boolean;
   logRequestsInstrumentedAsUnknown?: boolean;
+  dataConnectionsConsole?: boolean;
 }