clean up: remove unused Informer().HasSynced

[zjj2wry]

Feature Request

Is your feature request related to a problem? Please describe:

The shared informer factory has called the WaitForCacheSync method, and it is no longer need to call it separately for each controller. We can remove Informer ().HasSynced because it will not be used.

https://github.com/pingcap/tidb-operator/blob/master/pkg/controller/tidbcluster/tidb_cluster_controller.go#L248

Describe the feature you'd like:

Describe alternatives you've considered:

Teachability, Documentation, Adoption, Migration Strategy:

[github-actions[bot]]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 15 days

[drivebyer]

/assign