[feature request]improve configuration of concurrent platformadmin workers

[rambohe]

What would you like to be added:

please refer to pull request #1906 and improve platformadmin-workers configuration for platformadmin controller in yurt-manager component.

openyurt/pkg/yurtmanager/controller/platformadmin/platformadmin_controller.go

Line 58 in ed20955

 flag.IntVar(&concurrentReconciles, "platformadmin-workers", concurrentReconciles, "Max concurrent workers for PlatformAdmin controller.") 

others
/kind feature

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[在红尘中成仙]

\assign @MundaneImmortal