feat: Custom Healthcare API endpoint (#1367)

* Add ability to configure Google Cloud Healthcare API endpoint.

* Fixed bug in script.

* Fixed PR remark.

* Set Healthcare API endpoint in proper place.

platform/viewer/src/customHooks/useServer.js

@@ -18,6 +18,7 @@ const getActiveServer = servers => {
 const getServers = (appConfig, project, location, dataset, dicomStore) => {
   let servers = [];
   if (appConfig.enableGoogleCloudAdapter) {
+    GoogleCloudApi.urlBase = appConfig.healthcareApiEndpoint;
     const pathUrl = GoogleCloudApi.getUrlBaseDicomWeb(
       project,
       location,

platform/viewer/src/googleCloud/api/GoogleCloudApi.js

@@ -15,7 +15,11 @@ class GoogleCloudApi {
   }
 
   get urlBase() {
-    return `https://healthcare.googleapis.com/v1beta1`;
+    return this.healthcareApiEndpoint || 'https://healthcare.googleapis.com/v1beta1';
+  }
+
+  set urlBase(url) {
+    this.healthcareApiEndpoint = url;
   }
 
   get urlBaseProject() {