report_converter: add support for ruff json input

[melven]

Add support for the json output format of the ruff python checker. Also works for fortitude which is based on ruff (https://github.com/PlasmaFAIR/fortitude)

[bruntib]

@melven, Thanks for the development, it's great to have a report-converter for ruff.
For some reason the "Tools" test failed, but I can't see the error message. Could you, please, touch the commit (git commit --amend --no-edit) and force push so tests are re-executed? Hopefully this will solve.
Thank you!

[melven]

@melven, Thanks for the development, it's great to have a report-converter for ruff. For some reason the "Tools" test failed, but I can't see the error message. Could you, please, touch the commit (git commit --amend --no-edit) and force push so tests are re-executed? Hopefully this will solve. Thank you!

Hi @bruntib

I rebased onto the current master, let's see if everything works!

[melven]

Ok, this still fails but I don't really understand why. I tried to make the ruff test very similar to the pylint test.

[bruntib]

@melven Thanks for the rebase. Also, a required test is failing. We could merge this PR when it's fixed. Thank you!

[melven]

Sorry @bruntib

This was a problem with an absolute path in the report file from ruff. I replaced it with a relative path for testing.

[melven]

Hi @bruntib

Now the unit test succeeds. There is one further problem with the GUI but I don't understand the error message or why this is related to my changes...

[gulyasgergely902]

Great work overall with a minor "issue". Even with that I approve the change.

[gulyasgergely902]

This comment in unnecessary here. Please remove.