Python support ListElement in MaD

[yoff]

It should be easy enough to ad tuple element (although these should take an index) and set element. List element was added in response to a user question. The change is trivial as it simply maps to the already supported subscript.

[Copilot]

Pull request overview

This PR adds support for the ListElement token in Models as Data (MaD) for Python, enabling users to specify list element access in data flow models. The implementation maps ListElement to the existing subscript functionality, reusing infrastructure already in place for list element content.

Key changes:

• Enabled ListElement token in MaD access paths by treating it the same as DictionaryElementAny
• Updated test case to verify list element source detection works correctly
• Added ListElement to the list of valid tokens for identifying access paths

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
python/ql/test/library-tests/frameworks/data/test.ext.yml	Uncommented test case for ListElement to validate the new functionality
python/ql/test/library-tests/frameworks/data/test.expected	Added expected test output showing that list element sources are now detected
python/ql/lib/semmle/python/frameworks/data/internal/ApiGraphModelsSpecific.qll	Added ListElement support to token handling predicates, mapping it to subscript access

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[Copilot]

The TODO comment should be updated to reflect that list support has now been added. Consider changing it to "TODO: Add support for tuples" since only tuple support remains unimplemented.

Suggested change

	# TODO: Add support for list/tuples
	# TODO: Add support for tuples

[tausbn]

I think this looks very reasonable, modulo a small issue of naming that I just want to make sure we've thought about. 🙂