Delete old duckdb index files

default/test/partial-index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:733e9425192c52c65e1f40d15670fb0222cc5a13121a9632b19b7dab7bc5995f
-size 10946621440

default/train/partial-index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:d61a49143b7ab641a2fbafe7349b376a14c456201d3e0e152415b0e6359d3c9e
-size 6251622400

default/val/partial-index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:75f8dfbf8bfa15325b5c7ab11115d95919718907205d23e43d2b72ee002b9856
-size 10066866176