Add Cognito permissions for AWS LBC

[danports]

This is needed for configuring Cognito authentication. The cognito-idp:DescribeUserPoolClient permission has been present in the upstream install docs for a long time. I haven't looked into the integration test infrastructure so I have no idea if I should have updated all of the stuff in tests/integration/update_cluster.

[k8s-ci-robot]

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[hakman]

/ok-to-test

[hakman]

I haven't looked into the integration test infrastructure so I have no idea if I should have updated all of the stuff in tests/integration/update_cluster.

Try running hack/update_expected.sh.

[hakman]

Please squash commits when all tests are passing :)

[danports]

I ran hack/update_expected.sh but it didn't change anything, so I'm guessing the earlier test failures (besides the gofmt issue I just fixed) are flakes?

[hakman]

Failed tests are just flakes. Once you squash, I will approve the PR. 👍

[danports]

Alright, squashed!

[k8s-ci-robot]

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This pull-request has been approved by: hakman

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[danports]

Can we backport this to 1.27? Do these commands work?

/cherrypick release-1.27
/cherrypick release-1.28