chore: mark some unit tests under test/pipeline

[ZanSara]

Proposed Changes:

• As I noticed in another PR that almost no pipeline unit tests are run, this PR marks several unit tests under test/pipeline

How did you test it?

• CI

Notes for the reviewer

n/a

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[coveralls]

Pull Request Test Coverage Report for Build 5245533752

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.0%) to 41.933%

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Totals
Change from base Build 5242553472:	1.0%
Covered Lines:	9406
Relevant Lines:	22431

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💛 - Coveralls

[julian-risch]

Looks good to me! 👍 I'm surprised we didn't notice that earlier. Good thing that you noticed it! 👍 No changes requested. One test was borderline unit test in my opinion though. The one testing that elasticsearch is not responding given a wrong port. Doesn't hurt but also isn't really testing something if there is no elasticsearch running anyway in a unit test.