test: refactor service tests by removing unnecessary logic

[reubenmiller]

Proposed changes

Refactor service system tests to remove unnecessary logic in an attempt to make the tests more stable.

The tests are passing reliably when using the instructions in #2423

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

• flaky system test: Test if all c8y services are up in service_monitoring.robot #2427
• flaky system test: Test if all c8y services are using configured service type #2423

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
378	0	3	378	100	59m48.642999999s