Increased create extensions instance timeout to 1h to match the backend (#5969)

Author: pavelgj

CHANGELOG.md

@@ -1 +1,2 @@
+- Increased extension instance create poll timeout to 1h to match backend (#5969).
 - Refactored `ext:install` to use the latest extension metadata. (#5997)

src/extensions/extensionsApi.ts

@@ -58,7 +58,7 @@ async function createInstanceHelper(
     apiOrigin: extensionsOrigin,
     apiVersion: EXTENSIONS_API_VERSION,
     operationResourceName: createRes.body.name,
-    masterTimeout: 600000,
+    masterTimeout: 3600000,
   });
   return pollRes;
 }