Delete old duckdb index files

default/partial-train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:555488bb235a8a46df074548d2fb60e4fe79d836832a6c14bab167cdde30877e
-size 6266564608

sample-100B/partial-train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:8c3c70f7db0e7df1271f7c7cce8260171ef63b05b8a86d26e0b7a52d06a42420
-size 5675954176

sample-10B/partial-train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:be96cb2bb5d4f64eee3808db2061dc2b57f1a7544eef632da545e58da711b664
-size 5604388864

sample-1T/partial-train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:5a1f90460f88e4c4fcd56311364a07465f4796e39cc1554bf8e0fb1cd78daaf4
-size 6262632448

sample/partial-train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:778a740c3549675742abc88e25c17185f0f951d2ab252f584985770727722e62
-size 6164852736