refactor: CommandStatus::Executing takes extra MQTT messages

[rina23q]

Proposed changes

Unlike other c8y operations that we support so far, c8y_DeviceProfile operation requires a inventory update MQTT message after EXECUTING message. Refer to the doc.

This PR changes CommandStatus::Executing to take extra MQTT messages after sending EXECUTING message to c8y.

P.S.
If we have a requirement that extra messages need to be send right before the EXECUTING message, this API need to be changed again. It will probably look like CommandStatus::Executing {messages: Vec<MqttMessage>} and all operation handlers need to add 501,<op_type message to the vector explicitly. Since there is no such a requirement as of now, I prefer to hide 501 message creation inside the API as it is.

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

Attention: Patch coverage is 83.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 78.0%. Comparing base (be3b850) to head (094ec0b).
Report is 8 commits behind head on main.

Files	Patch %	Lines
.../c8y_mapper_ext/src/operations/handlers/restart.rs	0.0%	3 Missing ⚠️
...ions/c8y_mapper_ext/src/operations/handlers/mod.rs	83.3%	0 Missing and 1 partial ⚠️

Additional details and impacted files

Files	Coverage Δ
...per_ext/src/operations/handlers/config_snapshot.rs	91.7% <100.0%> (+<0.1%)	⬆️
...apper_ext/src/operations/handlers/config_update.rs	92.7% <100.0%> (+<0.1%)	⬆️
...per_ext/src/operations/handlers/firmware_update.rs	93.1% <100.0%> (+<0.1%)	⬆️
...y_mapper_ext/src/operations/handlers/log_upload.rs	92.7% <100.0%> (+<0.1%)	⬆️
...per_ext/src/operations/handlers/software_update.rs	93.7% <100.0%> (+<0.1%)	⬆️
...ions/c8y_mapper_ext/src/operations/handlers/mod.rs	77.2% <83.3%> (+0.1%)	⬆️
.../c8y_mapper_ext/src/operations/handlers/restart.rs	75.0% <0.0%> (-5.0%)	⬇️

... and 6 files with indirect coverage changes

[github-actions]

Robot Results

✅ Passed	❌ Failed	⏭️ Skipped	Total	Pass %	⏱️ Duration
491	0	2	491	100	1h21m58.486650999s