Env vars improvements

[Silex]

Describe your changes

• Fixes issues introduced by #3972 (only applied to persistent flags and not all flags).
• Adds env var supports to management service.
• Updates docker compose templates to use env vars.
• Remove redundant "console" flag in relay.

Please verify the commit that adds env vars to management, I didn't test it.

Issue ticket number and link

Stack

Checklist

• [x] Is it a bug fix
• [ ] Is a typo/documentation fix
• [x] Is a feature enhancement
• [ ] It is a refactor
• [ ] Created tests that fail without the change (if possible)
• [ ] Extended the README / documentation, if necessary

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