E2E: Add wait_for_requests after clicking namespaces_list dropdown
What does this MR do and why?
I still haven't been able to fully reproduce #375670 (closed) manually, locally against GDK nor when running against the master or nightly Docker images. However, I did find that around the same time this failure started to occur, the transfer project dropdown was changed from using GraphQL to REST API
Before this change, the default options in the dropdown were already available on page load. Now, when clicking the dropdown, an API request is triggered to populate these options.
One guess is that there could be issues or some kind of race condition with the test's actions and this new request. This MR adds an extra wait_for_requests
to see if it could help stabilize things.
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