In this commit, we unit test karmada search controller
on creating new controller and handling the following events
watched by the shared informer: `addCluster`, `updateCluster`,
`deleteCluster`, `addResourceRegistry`, `updateResourceRegistry`,
and `deleteResourceRegistry` making sure those handled and cached
correctly to the indexer.
Signed-off-by: Mohamed Awnallah <mohamedmohey2352@gmail.com>
Mohamed Awnallah