Add test for Proxy to Hub API

[aufi]

One of roles of Konveyor UI is to proxy requests to Hub API, when this would fail, UI can effectively break API (test suite).

It is needed add a simple check that running UI correctly passes requests to Hub API, e.g. list tags (which returns a non-empty JSON even on fresh Konveyor installation).

[sjd78]

See konveyor/tackle2-ui#1405

[sjd78]

I'm assuming the tier-0 UI test

See konveyor/tackle2-ui#1405

Am I correct in assuming the tier-0 UI tests in global-ci would cover this issue?

[aufi]

Correct, current UI tests executed by #1405 would cover this issue (since UI was not working), but I was thinking this issue to add a simple test for access Hub API via UI proxy, so a small extension of UI tests (and correct, it should be execute as part of the UI CI test suite).