[CLI] Cluster logs CLI improvements: new log labels + test coverage increasing

[dmitsf]

What does this PR do?

The PR just adds two things to the PR on cluster logs, in order to make small improvements:

• More CLI tests on getting cluster logs command;
• Few more log labels to be parsed.

I think there are no significant changes for our changelog.

Does your PR introduce any breaking changes? If yes, please list them.

No, it doesn't.

Before submitting

• Was this discussed/approved via a GitHub issue? (not for typos and docs)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure your PR does only one thing, instead of bundling different changes together?
• Did you make sure to update the documentation with your changes? (if necessary)
• Did you write any new necessary tests? (not for typos and docs)
• Did you verify new and existing tests pass locally with your changes?
• Did you list all the breaking changes introduced by this pull request?
• Did you update the CHANGELOG? (not for typos, docs, test updates, or minor internal changes/refactors)

PR review

Anyone in the community is welcome to review the PR.
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• Is this pull request ready for review? (if not, please submit in draft mode)
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Did you have fun?

Make sure you had fun coding 🙃

cc @Borda @akihironitta