fix(#3048): don't send status update for sub-workflow operations

[Bravo555]

Proposed changes

Avoid processing operations on a sub-workflow operation topic in OperationHandler.

To verify the fix I created two unit tests:

• one for OperationHandler to test its public interface
• one more permanent test in c8y_mapper_ext::tests to make sure it still
  holds even if OperationHandler implementation changes

As this check could easily be done in c8y mapper unit tests, I didn't create an integration test.

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

• tedge-mapper-c8y is sending cloud operation status for sub workflow calls #3048

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

To avoid similar problems in the future, we should distinguish sub-workflow command ids on a type level.

[codecov]

Codecov Report

Attention: Patch coverage is 92.10526% with 6 lines in your changes missing coverage. Please review.

Project coverage is 78.0%. Comparing base (be3b850) to head (dc7c336).
Report is 82 commits behind head on main.

Files	Patch %	Lines
...xtensions/c8y_mapper_ext/src/operations/handler.rs	94.1%	0 Missing and 3 partials ⚠️
crates/extensions/c8y_mapper_ext/src/tests.rs	88.0%	0 Missing and 3 partials ⚠️

Additional details and impacted files

Files	Coverage Δ
...xtensions/c8y_mapper_ext/src/operations/handler.rs	95.3% <94.1%> (-0.2%)	⬇️
crates/extensions/c8y_mapper_ext/src/tests.rs	92.7% <88.0%> (-0.1%)	⬇️

... and 8 files with indirect coverage changes

[rina23q]

LGTM

[github-actions]

Robot Results

✅ Passed	❌ Failed	⏭️ Skipped	Total	Pass %	⏱️ Duration
491	0	2	491	100	1h21m49.561932s