chore: mark generated drizzle meta as generated

Author: kathiekiwi

.gitattributes

@@ -1,4 +1,5 @@
 # Generated, not hand-written: collapsed in diffs and excluded from language stats.
 internal-packages/dashboard-agent-db/drizzle/meta/*.json linguist-generated=true
+internal-packages/dashboard-agent-db/drizzle/meta/** linguist-generated=true
 **/__snapshots__/*.snap linguist-generated=true
 pnpm-lock.yaml linguist-generated=true