Avoid Concurrent writes to ManagedClusterList

[coleenquadros]

https://issues.redhat.com/browse/ACM-12372

[openshift-ci]

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[coleenquadros]

/retest

[coleenquadros]

/retest-required

[sonarcloud]

Quality Gate failed

Failed conditions
25.7% Coverage on New Code (required ≥ 70%)

See analysis details on SonarCloud

[openshift-ci]

@coleenquadros: The following test 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/sonarcloud	639dda8	link	true	/test sonarcloud

Full PR test history. Your PR dashboard.

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