feat: add labels to helm chart entities

[miguelhrocha]

Background

This PR solves the issue raised in https://github.com/tensorlakeai/indexify/issues/929. It adds awareness of labels to the following entities:

1. Indexify server.
2. Any executor.
3. Indexify's server Pod.
4. Indexify's server volume claim.

Steps to reproduce

1. Modify the local.yaml file with any label in any of: .server.labels, .server.pod.labels, executors[n].labels, .server.persistence.labels.
2. Run helm template local -f local.yaml .