Delete old duckdb index files

default/test/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:2611f2c20dc4495722684a25029b9b2c38d5fba3f02a77e1ec6db866571e736d
-size 2633728

default/train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:0d64a7317afface02f7cbbcf94bd525ee7a2b02c0499b9563907b354f4dee517
-size 33042432

default/validation/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:a4db1717cba9b324441da2b8eb2e980f4c4418feedcdd1d905f1bf4de1eccc39
-size 8138752

qbao775--PARARULE-Plus-Depth-4/train/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:50c7b578c794c79dd689cec96496e51065e588a90b0db6c9bacd29d951c89139
-size 33566720