helm: Add rustfs as object store

[simonswine]

This PR adds rustfs as an alternative object storage backend to MinIO for the Pyroscope Helm chart. Rustfs is a lightweight, S3-compatible object storage solution that can serve as a drop-in replacement for MinIO in development and testing environments.

Changes

• Added rustfs Helm chart dependency (v1.0.3-cs.3 from simonswine/helm-charts)
• Updated Makefile to use rustfs.enabled=true instead of minio.enabled=true for microservices architecture
• Updated Pyroscope configuration to use rustfs endpoint (pyroscope-dev-rustfs-svc:9000) with rustfs credentials

Testing

# Code generation
make helm/docs helm/check helm/lint

# Run microservices cell
$make deploy-micro-services

Notes

I was not able to just use the upstream helm chart for our use case, will open PR to upstream my changes:

• helm: Mount /tmp as emptyDir rustfs/rustfs#1105
• helm: Use service.type from Values rustfs/rustfs#1106
• helm: Allow configuration of volumes per replica rustfs/rustfs#1107