tests(logfile): improve log request tests

[reubenmiller]

Proposed changes

Improve the log file request integration tests:

• add library function to check service status of child devices and switch to new tedge interface
• use recent timestamp instead of 1970 as this is more aligned to how the UI behaves
• fix timestamp bug where the tests were using a fixed timezone which meant that the local time was being erroneously cast to UTC leading to unexpected dateFrom/dateTo values
• use tedge config to control te topic instead of flags
• add notes about when workarounds in tests can be removed

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
273	0	5	273	100	56m15.240999999s

[reubenmiller]

Closing as the changes have been merged into #2262 as that PR contained the Rust fixes which this test was covering (as well as some general test improvements on the same subject matter).