Fix update proxy in cluster rosa

[bardielle]

While updating proxy to nil it wasn't update the internal attributes in ocm backend

[nirarg]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nirarg

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[openshift-ci]

@bardielle: 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/managed-oidc-config-e2e-presubmit	731365a	link	true	/test managed-oidc-config-e2e-presubmit
ci/prow/unmanaged-oidc-config-e2e-presubmit	731365a	link	true	/test unmanaged-oidc-config-e2e-presubmit

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