Delete old duckdb index files

default/partial-test/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:40ab49563203a6ae749b2655f1750478cf85e532a476660fa2e52b77b90eb5e2
-size 892350464

default/partial-validation/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:8bd32e1a529e3ec227d5a36d9a60d42a07645c71e76a863d1dbba083d99ab6b3
-size 891826176