fix: Subscribe to C8Y topics using QoS 1

[didier-wenzek]

Proposed changes

Subscribe to C8Y topics using QoS 1

• There is no point to use QoS 2 as the session is cleared on each reconnect
• The builtin bridge is already using QoS 1

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

All modified and coverable lines are covered by tests ✅

Additional details and impacted files

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[github-actions]

Robot Results

✅ Passed	❌ Failed	⏭️ Skipped	Total	Pass %	⏱️ Duration
528	0	2	528	100	1h32m31.035133s

[reubenmiller]

This might help avoid situations where the local bridge is waiting for a response from the server but it never arrives. #3141

[reubenmiller]

Approved. Makes a lot of sense, and hopefully reduces scenarios like #3141

[rina23q]

Approved