Delete old duckdb index files

with-filtering/train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:b2ec1695c5638dc660690e972624c661b5e03e4b7f8daf45dbbbdeecbca30337
-size 42217472

with-filtering/validation/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:1c286712fe5033518e8aed875d4306ab65fa059686fdc38050ad2f65d0db1951
-size 1585152

without-filtering/train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:6307210123d8bf97bd7de32e6e3ffdc752a8da51969ff7975e3cc0f56f732d86
-size 43266048

without-filtering/validation/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:77f808cfc6fd367a47357bbc48d839e85dbb5e2982d6933a1e1b7067a4817123
-size 1847296