fix AddFilesIT filter for BigLake

[aIbrahiim]

Fixes: #31931
Successful run: https://github.com/apache/beam/actions/runs/30426319856

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[Abacn]

Do we now which PR broke this test? It's failing since July 23, but recent IcebergIO changes #39408 do not match the timeline

cc: @ahmedabu98

[ahmedabu98]

I think it's new behavior from the Lakehouse catalog. Let me confirm

[ahmedabu98]

Just confirmed, they put things under an id directory for security reasons

[aIbrahiim]

@Abacn Lakehouse now nests data under {table}/{id}/data/ (security). The IT assumed {table}/data/, so I updated the filter to match the table prefix and a /data/ segment so it works for both the old and new layouts and still ignores metadata under .../metadata/....