[backport] [scraper] Pass JSON serialized path settings to python scrapers

[Montellese]

Description

This is a partial backport of #17062 and #17063.

Motivation and Context

It was requested by @romanvm and @rmrector.

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Clean up (non-breaking change which removes non-working, unmaintained functionality)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that will cause existing functionality to change)
• Cosmetic change (non-breaking change that doesn't touch code)
• None of the above (please explain below)

Checklist:

• My code follows the Code Guidelines of this project
• My change requires a change to the documentation, either Doxygen or wiki
• I have updated the documentation accordingly
• I have read the Contributing document
• I have added tests to cover my change
• All new and existing tests passed

[Montellese]

IMO this is ready to be merged into Leia. Who is the release manager?

[rmrector]

@DaveTBlake

[DaveTBlake]

Sorry I have not been following this work. I'm sure it is all fine, but can someone just confirm the scope of the impact of this change. I assume Python scrapers only, is that correct?

[rmrector]

Ya, the functional change is limited to Python scrapers. There is also a structural change for subsettings, motivation detailed in the second paragraph of #17062 .

[Montellese]

Actually I think this would even work without refactoring where ISubSettings are handled. I'll give it a try and report back. Without that commit this would purely touch the python scraper implementation.

[Montellese]

Yup that seems to work as well. @rmrector could you verify the functionality again with the reduced version?

[rmrector]

Yup, a quick run works just fine. Thanks for slimming down the backport.

[Montellese]

@DaveTBlake now it's really ready :-)

[DaveTBlake]

Thanks for slimming this down @Montellese , always good to simplify backports if possible, glad that I was slow on the button.