Enable trusted_execution_cluster tests on OpenShift

[iroykaufman]

This commit updates the test utils to support running trusted execution cluster tests on the OpenShift platform.

To execute these tests on OpenShift, the following environment variables must be configured:

• REGISTRY: The repository location of the container image.
• TAG: The specific tag of the container image. (default latest)
• CLUSTER_URL: The API URL of the target cluster.
• PLATFORM: Set this to openshift.

example: RUST_LOG=info REGISTRY=quay.io PLATFORM=openshift CLUSTER_URL=<SECRET_URL> cargo test --test trusted_execution_cluster -- --no-capture

[openshift-ci]

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This pull-request has been approved by: iroykaufman, Jakob-Naucke

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[openshift-ci]

@iroykaufman: 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/infra-provision-verify	f6c77b2	link	true	/test infra-provision-verify
ci/prow/operator-lifecycle-verify	8e5ef07	link	true	/test operator-lifecycle-verify

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[alicefr]

Not sure if it make sense to create an abstraction and trait here for when we are in kubernetes and when we are in openshift, or it is a bit overkilled. @Jakob-Naucke WDYT?

[Jakob-Naucke]

Not sure if it make sense to create an abstraction and trait here for when we are in kubernetes and when we are in openshift, or it is a bit overkilled.

Hmm. I'm a bit in favour because I'm already checking against platform two extra times in #170.

[alicefr]

Not sure if it make sense to create an abstraction and trait here for when we are in kubernetes and when we are in openshift, or it is a bit overkilled.

Hmm. I'm a bit in favour because I'm already checking against platform two extra times in #170.

Yeah, I think we are going to have more places like this in the future where we need to distinguish the platform. @iroykaufman do you mind refactoring the code?