Add watch logic for addondeploymentconfig

[coleenquadros]

https://issues.redhat.com/browse/RHOBS-949
https://issues.redhat.com/browse/ACM-8312

From what I understand is that the placement controller has no logic to watch over the changes to addondeployment config. So any update to it will not be picked up by managerclusteraddon and clustermanagementaddon which are watched already but they only hold a ref to addondeploymentconfig and not the actual config.

The PR adds the watch logic in the placement controller to monitor changes in addondeployment config and sets up the request to reconcile and also apply change to all managed clusters

[openshift-ci]

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[sonarqubecloud]

SonarCloud Quality Gate failed.   

0 Bugs
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27.0% Coverage
0.0% Duplication

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[philipgough]

/retest

[openshift-ci]

@coleenquadros: 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/sonarcloud	47266f4	link	true	/test sonarcloud
ci/prow/e2e-kind	47266f4	link	true	/test e2e-kind

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