[IMP] Simplify environment variable injection in Helm charts using envFrom

[ascalotoru]

Summary

This PR replaces the manual environment variable mapping logic in
the irisapp and irisworker Helm charts with Kubernetes-native envFrom
references. This allows the deployments to load environment variables
directly from one or more secrets.

Motivation

Previously, only a single secret could be used, and adding or removing
environment variables required modifying the Helm template. Using envFrom
simplifies the templates, improves maintainability, and aligns with
Kubernetes best practices.

Changes

• Replaced the loop for POSTGRES_* variables in irisapp with envFrom.
• Added support for multiple secrets in both irisapp and irisworker via envFromSecrets.
• Adjusted values.yaml comments to clarify plural/multiple secrets support.

Benefits

• Cleaner and shorter Helm templates
• Multiple secret support
• No need to hardcode variable names
• Easier maintenance and consistency across environments

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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