Delete old duckdb index files

arxiv/partial-test/index.duckdb

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-size 186658816

arxiv/partial-train/index.duckdb

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-version https://git-lfs.github.com/spec/v1
-oid sha256:063e6aebbc651929a9bdf61f040686860fa432c0450b97273522a9b2bb136489
-size 4649660416

arxiv/partial-validation/index.duckdb

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-oid sha256:ddb7aab7ec4382a443496c6b47641e8f1219c60ae0e9545f081f526eb7f61a30
-size 184299520

arxiv/test/index.duckdb

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-oid sha256:bf45cb617b836635c911a4b51f5cb9ee320a40728d233b6159467281525cee84
-size 186396672

arxiv/validation/index.duckdb

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-oid sha256:87fded7761e293bae790b955f5e0dac79571ce6de69c8aae5f6ee63d7d3d62bc
-size 183775232

pubmed/test/index.duckdb

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-oid sha256:b0e1449771f19020102cc3ecdee83e50cc346f571d84c256a7d2a4346358835e
-size 118239232

pubmed/train/index.duckdb

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-oid sha256:aa3942c1a45db3e1f207320e1cc0b12ddc23c2dee77fa7e6a2b49a8828409964
-size 2237411328

pubmed/validation/index.duckdb

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-oid sha256:91c89cd8a2d559c072cf4b7fe98a8d49f70111576629fd6157537096dca67e78
-size 117190656