ci: separate jobs for unit and integration tests

[anakin87]

Related Issues

• fixes CI test work flow should separate unit and integration steps #86

Proposed Changes:

• run only unit tests in the existing unit-tests job
• create a similar job for integration tests

How did you test it?

CI

Notes for the reviewer

With this PR, integration tests depend on the linting job.
We can make different choices, but this seemed reasonable to me to avoid long running times.

I also experimented with cache (with an approach similar to that used in Haystack). Still, I encountered some issues and I also found out that restoring the cache is slow in some environments (Windows), so I decided to avoid it for the time being.

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 11034137945

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-3.7%) to 90.272%

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Totals
Change from base Build 11029532546:	-3.7%
Covered Lines:	1429
Relevant Lines:	1583

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💛 - Coveralls