[v1.18] added ginkgo test to verify dex volume and volumeMounts

[openshift-cherrypick-robot]

This is an automated cherry-pick of #963

/assign svghadi

[openshift-ci]

Hi @openshift-cherrypick-robot. Thanks for your PR.

I'm waiting for a redhat-developer member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[svghadi]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: svghadi

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