ARO HCP Add mock identity pool for e2e-parallel job leasing

[patriksuba]

AROSLSRE-519

[openshift-ci]

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: patriksuba
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[openshift-ci-robot]

[REHEARSALNOTIFIER]
@patriksuba: no rehearsable tests are affected by this change

Note: If this PR includes changes to step registry files (ci-operator/step-registry/) and you expected jobs to be found, try rebasing your PR onto the base branch. This helps pj-rehearse accurately detect changes when the base branch has moved forward.