[ACM-14176]: Ensure CMO ConfigMap is reconciled on any event

[philipgough]

Backport of #1610

1. Adds an integration test for merging of CMO ConfigMap with other clients
2. Adds the Delete event to the Watch for CMO ConfigMap
3. Explicitly adds the CMO ConfigMap reference to the filtered cache

[philipgough]

/test test-e2e

[philipgough]

/retest-required

[philipgough]

/test test-e2e

[coleenquadros]

/retest

[philipgough]

/retest

[sonarcloud]

Quality Gate failed

Failed conditions
B Maintainability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

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[openshift-ci]

@philipgough: 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	4acde49	link	false	/test sonarcloud

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[thibaultmg]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: philipgough, thibaultmg

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