[RHOAIENG-14687] Extend tests for certificate to assure that they are readable

[jstourac]

https://issues.redhat.com/browse/RHOAIENG-14687

Description

How Has This Been Tested?

In components/odh-notebook-controller run make test.

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[jiridanek]

/lgtm

was around while this was being made, so no complaints from me

[jstourac]

The e2e tests are failing due to an infra issue and are irrelevant for changes in this PR anyway, so overriding:

/override ci/prow/odh-notebook-controller-e2e

[openshift-ci]

@jstourac: Overrode contexts on behalf of jstourac: ci/prow/odh-notebook-controller-e2e

In response to this:

The e2e tests are failing due to an infra issue and are irrelevant for changes in this PR anyway, so overriding:

/override ci/prow/odh-notebook-controller-e2e

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[atheo89]

/lgtm

Also today the e2e is working!

[jstourac]

Thank you for the review, @atheo89

Also today the e2e is working!

well, if you're judging only based on the result here - actually I overrode them as they are irrelevant for this change anyway 👼

[jstourac]

Thank you all. I'm gonna merge this to move on.

/approve

[openshift-ci]

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