Bug 1755936: e2e: stabilize ingress metrics tests
Bug 1755936: e2e: stabilize ingress metrics tests

Sometimes Prometheus seems to report not having scraped the target
for the ingresscontroller created during this test, even after 4 minutes.

Since this test for the user-defined ingresscontroller seems inessential
compared to the latest ingress-operator e2e tests, rather than increasing
the timeout or spending additional effort to root-cause the scrape delay,
just delete the test to stabilize the test suite.

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