refactor: Refactor health status code

[albinsuresh]

Proposed changes

Refactor health status refactoring code, including addressing review comments from #2903

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

[github-actions]

Robot Results

✅ Passed	❌ Failed	⏭️ Skipped	Total	Pass %	⏱️ Duration
452	0	3	452	100	1h6m55.904892999s

[didier-wenzek]

This PR is a nice step forward, grouping all health-check related logic in one place . However, some constants have still to be made private, in order to avoid inappropriate uses.

[jarhodes314]

I'm happy with the changes asides from the aforementioned pub const issues

[codecov]

Codecov Report

Attention: Patch coverage is 79.73856% with 31 lines in your changes missing coverage. Please review.

Project coverage is 78.0%. Comparing base (f186b3f) to head (4914cff).
Report is 3 commits behind head on main.

Additional details and impacted files

Files	Coverage Δ
crates/core/c8y_api/src/utils.rs	0.0% <ø> (-69.0%)	⬇️
crates/core/tedge_api/src/health.rs	95.8% <100.0%> (+3.1%)	⬆️
crates/core/tedge_api/src/mqtt_topics.rs	88.1% <ø> (+1.1%)	⬆️
crates/extensions/c8y_mapper_ext/src/actor.rs	82.3% <100.0%> (ø)
crates/extensions/c8y_mapper_ext/src/converter.rs	83.7% <100.0%> (-0.1%)	⬇️
...s/extensions/c8y_mapper_ext/src/service_monitor.rs	97.7% <100.0%> (ø)
crates/extensions/c8y_mapper_ext/src/tests.rs	92.6% <100.0%> (-0.1%)	⬇️
crates/extensions/tedge_mqtt_bridge/src/lib.rs	89.1% <100.0%> (ø)
crates/extensions/c8y_mapper_ext/src/config.rs	48.2% <87.5%> (+0.5%)	⬆️
crates/core/tedge_mapper/src/c8y/mapper.rs	0.0% <0.0%> (ø)
... and 3 more

... and 3 files with indirect coverage changes

[didier-wenzek]

Unrelated to this PR, but this highlights an issue I got several time: this method uses a specific mqtt_schema only to parse a topic. The MQTT root prefix doesn't really matter and it would be more convenient to have a parse method returning all the component of a topic is set (i.e. not only the topic_id and channel but also the root prefix).

[didier-wenzek]

This PR is a nice step forward, grouping all health-check related logic in one place .