[cli] Load config function now loads .env from the config file folder path if config parameter is passed

[yavorsk]

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• Changelog updated
• Upgrade guide entry added

Description / Motivation

If configuration file/filepath has been provided with the --config parameter, it is likely that the cli is running outside of the context of the app folder - so we may need to load the .env from the folder where the cli config is located.
This will make it possible to run scaffold command outside of the app folder, with the caveat that .env and the cli.config should be in the same location.

Testing Details

• Unit Test Added
• Manual Test/Other (Please elaborate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)