Rollback NodePool Status Update Retry Mechanism

[tliu2021]

This update rolls back the previously implemented retry mechanism for updating the NodePool status. Since the IMS updates the NodePool's spec and metadata fields, conflicts can still occur if the NodePool status update is attempted on an outdated version of the resource.

[openshift-ci]

@tliu2021: 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/ci-job	cce240d	link	true	/test ci-job
ci/prow/ci-bundle-operator-bundle	cce240d	link	true	/test ci-bundle-operator-bundle
ci/prow/images	cce240d	link	true	/test images

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[donpenney]

/lgtm
/approve

[openshift-ci]

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