Fix segfault on label() of list element

[mdbenito]

This PR fixes this segfault

import database 'dataset/demo-db/parquet';
MATCH p = (n)-[:LivesIn]->(m:City) WITH nodes(p) AS ns RETURN label(ns[1]);

And another one on comparisons like ns[1] <> ns[0].

Here is the original bug report kuzudb/kuzu#6050, addressed in Ryu with predictable-labs/ryugraph#2

Despite the claim in #184 , this was never ported to ladybug, hence this PR.

The problem is incorrect binding of non-pattern exprs in label() and in comparisons. I added some new test cases for the latter.

Another two fixes were missing from that PR. I'll prepare separate ones for them

[mdbenito]

The failing test seems to be related to installation of the neo4j extension:

2026-06-22T12:56:43.6633903Z [2026-06-22 12:56:42.457] [info] QUERY: INSTALL neo4j;
2026-06-22T12:56:43.6634879Z /home/runner/work/ladybug/ladybug/test/test_runner/test_runner.cpp:184: Failure
2026-06-22T12:56:43.6663876Z Value of: queryResult->isSuccess()
2026-06-22T12:56:43.6693812Z   Actual: false
2026-06-22T12:56:43.6694353Z Expected: true
2026-06-22T12:56:43.6712055Z EXPECT OK BUT GOT ERROR: IO exception: Failed to create directory /home/runner/.lbdb/extension/0.17.0/linux_amd64/ due to: IO exception: Directory /home/runner/.lbdb/extension/0.17.0/linux_amd64 cannot be created. Check if it exists and remove it.

[adsharma]

Thank you for the fixes!

CI is sometimes flaky. Rerunning fixed it.