fix: env configuration loading for protocol config

[gurinderu]

Description

Fix protocol config configuration loading from env

Motivation

FLUENCE_PROTOCOL_CONFIG__UPGRADE_TIMEOUT doesn't work if another parameters from protocol config wasn't specified

Related Issue(s)

Proposed Changes

Screenshots (if applicable)

Additional Notes

Checklist

• The code follows the project's coding conventions and style guidelines.
• All tests related to the changes have passed successfully.
• Documentation has been updated to reflect the changes (if applicable).
• All new and existing unit tests have passed.
• I have self-reviewed my code and ensured its quality.
• I have added/updated necessary comments to aid understanding.

Reviewer Checklist

• Code has been reviewed for quality and adherence to guidelines.
• Tests have been reviewed and are sufficient to validate the changes.
• Documentation has been reviewed and is up to date.
• Any questions or concerns have been addressed.