wip: replacing deprecated minio with rustfs for quickstart

[shano]

What this change does

• Replaces the MinIO dev statestore used by scripts/quick-start.sh with RustFS (S3‑compatible) while keeping the same statestore flow.
• Updates the quick‑start wiring, sample BucketStateStore, and install manifest to point at the RustFS service/credentials.
• Renames Kubernetes resources from minio* to rustfs* for clarity.

Why we moved namespaces

• RustFS reads credentials from a Kubernetes Secret mounted into the Deployment. Since the RustFS pod runs in kratix-platform-system, the secret must live in the same namespace (Kubernetes secrets are namespace‑scoped).
• MinIO worked with the secret in default because the MinIO pod did not consume that secret; only the bucket‑creation job did. With RustFS, the pod itself needs the secret.

Testing

• Ran ./scripts/quick-start.sh --recreate.
• Installed the namespace and redis promises from kratix-marketplace, submitted resource requests, and verified:
  • Resources reconciled to the worker cluster.
  • Flux kratix-worker-dependencies and kratix-worker-resources are Ready.
  • RustFS bucket contains expected artifacts under worker-1/….
• Confirmed no MinIO resources exist after quick‑start.

✨ PR Description

Purpose: Replace deprecated MinIO with RustFS as the default S3-compatible storage backend for the quickstart environment to improve maintainability and modernize infrastructure dependencies.

Main changes:

• Replaced all MinIO references with RustFS across configuration files, scripts, and Kubernetes manifests including deployment specs and credentials
• Updated quick-start.sh script flags from --git-and-minio to --git-and-rustfs with corresponding variable and function name changes
• Added NoSuchKey error handling in S3Writer deleteObjects and RemoveObject methods to gracefully skip non-existent objects

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