fix(code-finder): match find_functions_by_argument against arg_types not parameter names - #1687

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Thanks @AloysJehwin — #1686 landed first for #1685 and carried the piece this one was missing: Function.arg_types is not a declared column on the embedded backends (KùzuDB/LadybugDB, the defaults), so a query-only change can't fix the report there; the schema migration had to come with it. Your CONTAINS-vs-exact matching thought is noted for a follow-up if generic types like Page<Order> need partial matching. FWIW the merged query needed surgery too — the original never filtered f at all, which is now pinned by a behavioral test on a real graph. Closing as overlapping.

All CI failures here are pre-existing on main and unrelated to this change:

• Build Test (3.12/3.13/3.14): test_elisp_parser.py::test_parse_elisp_normalized_output — KeyError: 'sample-callback' — also fails on main (e.g. run 33686444387)
• db-parity: ladybugdb exit code -11 (SIGSEGV in the ladybug shared library) — also fails on main (run 33686444386)
• e2e: same ladybugdb crash — also fails on main (run 33686444388)

This PR could not be reopened (viewer lacks reopen permission despite being author). Re-submitted as #1701.