e2e/proxy-skip: document a new BZ

[EmilienM]

Add a new BZ to watch for when investigating the failures when running
e2e behind a proxy.

[openshift-ci]

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This pull-request has been approved by: EmilienM
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[openshift-ci]

@EmilienM: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-single-node	82322f4	link	false	/test e2e-aws-single-node
ci/prow/e2e-gcp-upgrade	82322f4	link	true	/test e2e-gcp-upgrade

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