Delete old duckdb index files

default/train/partial-index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:119f8728a0c3805f2fe4a8c4a2892721da13929f5d79270975ed5b4f1a874258
-size 6602371072

default/validation/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:45c940ac607239f3528f35119efcb09f32958bb2dd6f3c2fb9ec36ba3c2e373b
-size 1323315200