Delete old duckdb index files

default/test/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:af5adc94465f9db6e9ff8d56133c39a589c3b7930a112993041f2b6555bdf954
-size 1323008

default/validation/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:8462cf78090c67d2dfcf6548ab64d44bf7972ad2c12906c8cf94b2040397fd60
-size 1060864