Use default(variable = "AutoFlag::Auto")

[didier-wenzek]

Simple follow up task suggested here #2398 (comment)

Proposed changes

• Use default(variable = "AutoFlag::Auto") for c8y.bridge.include.local_cleansession
• Remove impl From<&str> for AutoFlag as no more required.

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)
• I ran cargo fmt as mentioned in CODING_GUIDELINES
• I used cargo clippy 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

[codecov]

Codecov Report

Merging #2407 (614f472) into main (f2c7c61) will increase coverage by 0.0%.
The diff coverage is 100.0%.

Additional details and impacted files

Files	Coverage Δ
...n/tedge_config/src/tedge_config_cli/models/auto.rs	50.0% <ø> (+3.8%)	⬆️
.../tedge_config/src/tedge_config_cli/tedge_config.rs	82.0% <100.0%> (ø)

... and 5 files with indirect coverage changes

[github-actions]

Robot Results

✅ Passed	❌ Failed	⏭️ Skipped	Total	Pass %	⏱️ Duration
356	0	3	356	100	1h2m19.757s

[albinsuresh]

The test failure looks unrelated, hence approving.

[reubenmiller]

The test failure looks unrelated, hence approving.

I re-ran the system tests and also logged the flaky test #2416