chore: cleanup - lint and tests

[anakin87]

Proposed Changes:

• review pylint/ruff settings to increase strictness where possible
• minor type/format fixes
• make sure that document_store fixture is correctly shutdown in InMemoryDocumentStore tests (similar to test: prevent DocumentWriter tests from blocking CI #9448)
• avoid that Pipeline tests permanently write files on disk (using temp files)
• mark 2 slow unit tests (5s in my macOS) as integration tests -> this is the reason why coverage decreases

How did you test it?

CI

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: and added ! in case the PR includes breaking changes.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[coveralls]

Pull Request Test Coverage Report for Build 15536223117

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 46 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-0.3%) to 90.213%

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Files with Coverage Reduction	New Missed Lines	%
tools/component_tool.py	1	92.47%
core/serialization.py	3	96.47%
components/extractors/llm_metadata_extractor.py	9	82.3%
core/pipeline/base.py	33	86.87%

Totals
Change from base Build 15490301533:	-0.3%
Covered Lines:	11513
Relevant Lines:	12762

---

💛 - Coveralls

[anakin87]

enabling this argument without setting incremental = False does not work (mypy docs)

And incremental mode is useful for speeding up the execution of mypy locally

[julian-risch]

Looks very good to me! 🚀