Enable new backend endpoint to be passed to Data Explorer via message. (#1782)

src/Contracts/ViewModels.ts

@@ -387,6 +387,7 @@ export interface DataExplorerInputsFrame {
   dnsSuffix?: string;
   serverId?: string;
   extensionEndpoint?: string;
+  portalBackendEndpoint?: string;
   mongoProxyEndpoint?: string;
   cassandraProxyEndpoint?: string;
   subscriptionType?: SubscriptionType;

src/hooks/useKnockoutExplorer.ts

@@ -497,6 +497,7 @@ function updateContextsFromPortalMessage(inputs: DataExplorerInputsFrame) {
     ARM_ENDPOINT: normalizeArmEndpoint(inputs.csmEndpoint || configContext.ARM_ENDPOINT),
     MONGO_PROXY_ENDPOINT: inputs.mongoProxyEndpoint,
     CASSANDRA_PROXY_ENDPOINT: inputs.cassandraProxyEndpoint,
+    PORTAL_BACKEND_ENDPOINT: inputs.portalBackendEndpoint,
   });
 
   updateUserContext({