feat: Use sensitive values from 1Password vault in helm deployment workflow

[ppawlowski]

Description

This PR extends existing helm chart deployment reusable workflow by adding a possibility to use sensitive values stored in 1Password vault.
Workflow is extended by:

• 1Password CLI installation step
• render template file step (using op inject approach)
• prepare VALUE_FILES environmental variable - coma-separated list of value files used by the helm chart deployment action

Additionally, it sorts input values in a alphabetical order.

Related Issue(s)

https://github.com/FlowFuse/CloudProject/issues/366

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• Changes flowforge.yml?
  • Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production

Labels

• Backport needed? -> add the backport label
• Includes a DB migration? -> add the area:migration label