Delete old duckdb index files

default/training/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:2d7987b7f78575018b4635dbf89d1c12d066830e52df95f311bf6d2377a14790
-size 1585152

default/validation/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:7334c8e397d37be33d399e2e9ab20fe7a2518722c3a9cbe34009abdbaed7515f
-size 1060864