Delete old duckdb index files

default/validation/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:627c8b7f57e18844c8a8ff1b043b74b77165d445115a2c50ddf8c250ec358ca0
-size 9711616

shizhes--fortran_val/validation/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:d19566ffe057705db7ba77d90815ca50a15989e8ecb532cbbb436f035fedc04c
-size 9711616