[Impl] Delete expired index from Agent using k8s Job

[vankichi]

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

It is possible to send an index deletion request from the client, but this requires user intervention each time.

Describe the solution you'd like:

Allow old indexes to be deleted via a Kubernetes Job (periodic or one-time)

Describe alternatives you've considered:

The Remove or RemoveWithTimestamp RPC allows us to delete indexes at a specified time, so create a Kubernetes Job to execute this RPC.

We can implement it under the here