When build capability is disabled, ConfigObserver controller does not run

ConfigObserver controller waits until the all given informers are marked as synced including the build informer. However, when build capability is disabled, that causes ConfigObserver's blockage and never runs.

This is likely only happening on 4.15 because capability watching mechanism was bound to ConfigObserver in 4.15.

4.15

Launch cluster-bot cluster via "launch 4.15.0-0.nightly-2023-11-05-192858,openshift/cluster-openshift-controller-manager-operator#315 no-capabilities"

1.
2.
3.

ConfigObserver controller stuck in failure 

ConfigObserver controller runs and successfully clear all deployer service accounts when deploymentconfig capability is disabled.