LoadBalancer/NLB work-request-errors could be included as part of events for better error information.

[sindhusri16]

What would you like to be added:
Loadbalancer workRequestErrors are part of core services and cannot be fetched using workRequest. Due to this, the logs/events do not have the actual work-request errors and instead have this failure to fetch errors. This was encountered during testing of the PR: #378, which was merged before I could put the test-result for loadbalancer/networkloadbalancer.

Why is this needed:
The work-request-errors for loadbalancer and networkloadbalancer both should be populated in the events incase of failure of workrequests for better information.