Remove intergration test for the UR banner

This test will fail once we pass the expiration date of the banner in the gem.
We could add a setup and tear down to set the time to be within the banner
start and end date, but this will mean we need to remember to remove this test
once the banner expires. Which wouldn't be the end of the world. But if someone removes
the config from the gem (clearing up after the banner has expired) and forgets to remove
this test, then deploys of this application would be blocked as a consequence as the test will
start failing. This seems bad, and somewhat defeats the purpose of having the code in a gem.