[dynamic infra] Increase number of local path provisioner workers

By default, the number of local-path-provisioner worker is limited to 4: https://github.com/rancher/local-path-provisioner/blob/master/deploy/chart/local-path-provisioner/values.yaml#L130C1-L130C19

It creates a sort of bottleneck when a lot of loaders or listers needs to be created.

We should try to increase them and see the impact on the cluster.