Proposed changes

At some point, bridge_config started holding auth_type. This allows us to simplify the tedge connect implementation.

This PR is purely a refactoring; no behavioral changes are expected.

Note: crates/core/tedge/src/cli/connect/command.rs contains methods which are used only by c8y. I think we can move such methods to under c8y module. This will control the feature flag for clouds easier.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (general improvements like code refactoring that doesn't explicitly fix a bug or add any new functionality)
• Documentation Update (if none of the other choices apply)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Paste Link to the issue

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA (in all commits with git commit -s. You can activate automatic signing by running just prepare-dev once)
• I ran just format as mentioned in CODING_GUIDELINES
• I used just check as mentioned in CODING_GUIDELINES
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments