Delete old duckdb index files

default/test_matched/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:90e0787122dfd2402cc2eea74cbc67740bd9e5308b6e040bf62c8d4aa13905e8
-size 2895872

default/test_mismatched/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:db89ee5a5435cab3a09b2b971a51f92897dd604dbe08e3fa9cccb1c86432ec18
-size 3158016

default/train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:4c0ed7547321ed27a083bd39be364aed7c87a9c925cd61362f1a900de3b0c087
-size 94646272

default/validation_matched/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:f4b097340fe1f405270227e78103a88f441b2d94b850dcd5d205cafd15e54c94
-size 3944448

default/validation_mismatched/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:a9e18718b73a154f499236a86b9a29ee0ada0643dd2dddcb0f4a2eca4c9f2c38
-size 3158016