OCM-6419 | feat: fetch OIDC thumbprint from CS

[thomasmckay]

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@thomasmckay: 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/lint	dcd16cb	link	true	/test lint
ci/prow/images-images	dcd16cb	link	true	/test images-images
ci/prow/test	dcd16cb	link	true	/test test
ci/prow/coverage	dcd16cb	link	true	/test coverage
ci/prow/build	dcd16cb	link	true	/test build

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