moved delay simulation to the mock handler

src/Umbraco.Web.UI.Client/src/installer/installer-context.ts

@@ -30,12 +30,7 @@ export class UmbInstallerContext {
   }
 
   public requestInstall() {
-    return new Promise((resolve, reject) => {
-      setTimeout(() => {
-        // simulate 2 sec delay
-        postInstall(this._data.getValue()).then(resolve, reject);
-      }, 2000);
-    });
+    return postInstall(this._data.getValue());
   }
 
   private loadIntallerSettings() {

src/Umbraco.Web.UI.Client/src/mocks/domains/install.handlers.ts

@@ -71,7 +71,9 @@ export const handlers = [
     );
   }),
 
-  rest.post<UmbracoPerformInstallRequest>('/umbraco/backoffice/install', (req, res, ctx) => {
+  rest.post<UmbracoPerformInstallRequest>('/umbraco/backoffice/install', async (req, res, ctx) => {
+    await new Promise((resolve) => setTimeout(resolve, (Math.random() + 1) * 1000)); // simulate a delay of 1-2 seconds
+
     if (req.body.database.databaseName === 'fail') {
       return res(
         // Respond with a 200 status code