test: fix unit test to pass when the unit socket file exists

[rina23q]

Proposed changes

Fix the issue of a unit test reported in #3007 (comment)

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

[Bravo555]

Long-term I think we should remove filesystem reads from the TryFrom<C8yRemoteAccessPluginOpt> for Command block, as it's really unexpected, but good to see the test working now.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.0%. Comparing base (a3a5356) to head (b79f03a).
Report is 9 commits behind head on main.

Files	Patch %	Lines
plugins/c8y_remote_access_plugin/src/input.rs	75.0%	1 Missing ⚠️

Additional details and impacted files

Files	Coverage Δ
plugins/c8y_remote_access_plugin/src/input.rs	80.3% <75.0%> (-0.6%)	⬇️

... and 7 files with indirect coverage changes

[github-actions]

Robot Results

✅ Passed	❌ Failed	⏭️ Skipped	Total	Pass %	⏱️ Duration
490	0	2	490	100	1h22m20.870731999s