test: [M3-9176] - Add integration test for Upgrade to new Linode Interface flow (#12259)

* M3-9176 Add integration test for Upgrade to new Linode Interface flow

* Added changeset: Add integration test for Upgrade to new Linode Interface flow

* Fixed comments

* Fixing linting issue.

* Fixed comments

Author: cliu-akamai

packages/manager/.changeset/pr-12259-tests-1747849345030.md

@@ -0,0 +1,5 @@
+---
+"@linode/manager": Tests
+---
+
+Add integration test for Upgrade to new Linode Interface flow ([#12259](https://github.com/linode/manager/pull/12259))