Delete old duckdb index files

default/cot/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:86d337e5bd368d3308b3673c68b6d011641834df24932d0c5258a32cb66b33fb
-size 469774336

default/dialog/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:c6b7680bfa84fd348ef88196a138706e2fbbfa71782abb1dd6da049be6625e46
-size 2274373632

default/flan2021/partial-index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:9c522aea64a8c38fc263dde139e6f80421c60972a852df0e122d297edbad550c
-size 10053496832

default/niv2/partial-index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:a8376592af498ce734213f09dadd965b8f7f51c55d8abcf58cfd854baaa062c0
-size 11229999104

default/t0/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:fad4b6f3949e8e59e09e1cb448b855ce85bdc30515c3cd7113afcd10c04fe047
-size 6807891968