test: Add utility then step in feature testing to draw pipeline to file

[silvanocerza]

Proposed Changes:

Small utility that ease visualization of a Pipeline graph.

To use it we just need to add a new Then step in a scenario like so:

    Scenario Outline: Running a correct Pipeline
        Given a pipeline <kind>
        When I run the Pipeline
        Then draw it to file
        Then it should return the expected result
        And components ran in the expected order

The images will be saved in a test_pipeline_graphs folder in the project's root.
This just an utility step meant to be used locally to ease some debugging.

How did you test it?

I added a Then step to a scenario and run it.

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 10367114382

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 90.113%

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Totals
Change from base Build 10351241196:	0.0%
Covered Lines:	6954
Relevant Lines:	7717

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💛 - Coveralls

[shadeMe]

Test failure looks unrelated

[silvanocerza]

Merging, tests are failing for unrelated reasons.