chore: exclude some `logs-monitor` code from coverage

[iliapolo]

Code that may or may not run should be excluded from coverage.

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[iliapolo]

Currently affecting this PR: https://github.com/aws/aws-cdk/pull/29458

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 77.30%. Comparing base (b763d86) to head (ed0175a). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #32107 +/- ## ========================================== - Coverage 77.30% 77.30% -0.01% ========================================== Files 114 114 Lines 7628 7627 -1 Branches 1360 1360 ========================================== - Hits 5897 5896 -1 Misses 1549 1549 Partials 182 182 ``` | [Flag](https://app.codecov.io/gh/aws/aws-cdk/pull/32107/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws) | Coverage Δ | | |---|---|---| | [suite.unit](https://app.codecov.io/gh/aws/aws-cdk/pull/32107/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws) | `77.30% <ø> (-0.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws#carryforward-flags-in-the-pull-request-comment) to find out more. | [Components](https://app.codecov.io/gh/aws/aws-cdk/pull/32107/components?src=pr&el=components&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws) | Coverage Δ | | |---|---|---| | [packages/aws-cdk](https://app.codecov.io/gh/aws/aws-cdk/pull/32107/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws) | `77.30% <ø> (-0.01%)` | :arrow_down: |

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: ed0175ab614d9a8e1cf82bc8617eada49be1456b
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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